diff --git a/01-run-quit.html b/01-run-quit.html
index ffd0435dd..7a8da946b 100644
--- a/01-run-quit.html
+++ b/01-run-quit.html
@@ -1190,7 +1190,7 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
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   "dateCreated": "2016-01-07",
   "dateModified": "2023-06-07",
-  "datePublished": "2024-01-16"
+  "datePublished": "2024-01-23"
 }
 
   </script><script>
diff --git a/02-variables.html b/02-variables.html
index b1d66270d..006ca04f3 100644
--- a/02-variables.html
+++ b/02-variables.html
@@ -1014,7 +1014,7 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
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   "dateCreated": "2016-01-07",
   "dateModified": "2023-05-02",
-  "datePublished": "2024-01-16"
+  "datePublished": "2024-01-23"
 }
 
   </script><script>
diff --git a/03-types-conversion.html b/03-types-conversion.html
index 32f91b632..52e20fbd4 100644
--- a/03-types-conversion.html
+++ b/03-types-conversion.html
@@ -1092,7 +1092,7 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
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   "dateCreated": "2016-01-07",
   "dateModified": "2023-05-02",
-  "datePublished": "2024-01-16"
+  "datePublished": "2024-01-23"
 }
 
   </script><script>
diff --git a/04-built-in.html b/04-built-in.html
index 8237f4f2e..28d1c1423 100644
--- a/04-built-in.html
+++ b/04-built-in.html
@@ -997,7 +997,7 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
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   "dateCreated": "2016-01-07",
   "dateModified": "2023-05-02",
-  "datePublished": "2024-01-16"
+  "datePublished": "2024-01-23"
 }
 
   </script><script>
diff --git a/05-coffee.html b/05-coffee.html
index 6947b2df6..7b1f4e9a0 100644
--- a/05-coffee.html
+++ b/05-coffee.html
@@ -463,7 +463,7 @@ <h1>Morning Coffee</h1>
   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/05-coffee.html",
   "dateCreated": "2016-01-07",
   "dateModified": "2023-05-02",
-  "datePublished": "2024-01-16"
+  "datePublished": "2024-01-23"
 }
 
   </script><script>
diff --git a/06-libraries.html b/06-libraries.html
index 2230f0b6f..88749078d 100644
--- a/06-libraries.html
+++ b/06-libraries.html
@@ -1044,7 +1044,7 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/06-libraries.html",
   "dateCreated": "2016-01-07",
   "dateModified": "2023-05-02",
-  "datePublished": "2024-01-16"
+  "datePublished": "2024-01-23"
 }
 
   </script><script>
diff --git a/07-reading-tabular.html b/07-reading-tabular.html
index fb2809445..a810028e4 100644
--- a/07-reading-tabular.html
+++ b/07-reading-tabular.html
@@ -1011,7 +1011,7 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/07-reading-tabular.html",
   "dateCreated": "2016-01-07",
   "dateModified": "2023-05-02",
-  "datePublished": "2024-01-16"
+  "datePublished": "2024-01-23"
 }
 
   </script><script>
diff --git a/08-data-frames.html b/08-data-frames.html
index 9c26f01ca..073fa1186 100644
--- a/08-data-frames.html
+++ b/08-data-frames.html
@@ -781,7 +781,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution1" aria-expanded="false" aria-controls="collapseSolution1">
   <h4 class="accordion-header" id="headingSolution1">Show me the solution</h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <p>The selection can be done by using the labels for both the row
 (“Serbia”) and the column (“gdpPercap_2007”):</p>
@@ -825,7 +825,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution2" aria-expanded="false" aria-controls="collapseSolution2">
   <h4 class="accordion-header" id="headingSolution2">Show me the solution</h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <p>No, they do not produce the same output! The output of the first
 statement is:</p>
@@ -884,7 +884,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution3" aria-expanded="false" aria-controls="collapseSolution3">
   <h4 class="accordion-header" id="headingSolution3">Show me the solution</h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>Let’s go through this piece of code line by line.</p>
 <div class="codewrapper sourceCode" id="cb32">
@@ -966,7 +966,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution4" aria-expanded="false" aria-controls="collapseSolution4">
   <h4 class="accordion-header" id="headingSolution4">Show me the solution</h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <p>For each column in <code>data</code>, <code>idxmin</code> will return
 the index value corresponding to each column’s minimum;
@@ -1002,7 +1002,7 @@ <h3 class="callout-title">Practice with Selection<a class="anchor" aria-label="a
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution5" aria-expanded="false" aria-controls="collapseSolution5">
   <h4 class="accordion-header" id="headingSolution5">Show me the solution</h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
 <div class="accordion-body">
 <p>1:</p>
 <div class="codewrapper sourceCode" id="cb38">
@@ -1065,7 +1065,7 @@ <h3 class="callout-title">Many Ways of Access<a class="anchor" aria-label="ancho
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution6" aria-expanded="false" aria-controls="collapseSolution6">
   <h4 class="accordion-header" id="headingSolution6">Show me the solution</h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
 <div class="accordion-body">
 <p>1. Access a single column:</p>
 <div class="codewrapper sourceCode" id="cb42">
@@ -1251,7 +1251,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution7" aria-expanded="false" aria-controls="collapseSolution7">
   <h4 class="accordion-header" id="headingSolution7">Show me the solution</h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
+<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
 <div class="accordion-body">
 <p>Among many choices, <code>dir()</code> lists the
 <code>median()</code> function as a possibility. Thus,</p>
@@ -1357,7 +1357,7 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/08-data-frames.html",
   "dateCreated": "2016-01-07",
   "dateModified": "2023-08-29",
-  "datePublished": "2024-01-16"
+  "datePublished": "2024-01-23"
 }
 
   </script><script>
diff --git a/09-plotting.html b/09-plotting.html
index d6aa7d072..f3b2f88a7 100644
--- a/09-plotting.html
+++ b/09-plotting.html
@@ -918,7 +918,7 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
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   "dateCreated": "2016-01-07",
   "dateModified": "2023-06-08",
-  "datePublished": "2024-01-16"
+  "datePublished": "2024-01-23"
 }
 
   </script><script>
diff --git a/10-lunch.html b/10-lunch.html
index d8511e5ed..589b26465 100644
--- a/10-lunch.html
+++ b/10-lunch.html
@@ -456,7 +456,7 @@ <h1>Lunch</h1>
   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/10-lunch.html",
   "dateCreated": "2016-01-07",
   "dateModified": "2023-05-02",
-  "datePublished": "2024-01-16"
+  "datePublished": "2024-01-23"
 }
 
   </script><script>
diff --git a/11-lists.html b/11-lists.html
index 9df3469da..5019df2e9 100644
--- a/11-lists.html
+++ b/11-lists.html
@@ -663,7 +663,7 @@ <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution1" aria-expanded="false" aria-controls="collapseSolution1">
   <h4 class="accordion-header" id="headingSolution1">Show me the solution</h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb22">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -698,7 +698,7 @@ <h3 class="callout-title">How Large is a Slice?<a class="anchor" aria-label="anc
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution2" aria-expanded="false" aria-controls="collapseSolution2">
   <h4 class="accordion-header" id="headingSolution2">Show me the solution</h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <p>The list <code>values[start:stop]</code> has up to
 <code>stop - start</code> elements. For example,
@@ -742,7 +742,7 @@ <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution3" aria-expanded="false" aria-controls="collapseSolution3">
   <h4 class="accordion-header" id="headingSolution3">Show me the solution</h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li>
 <a href="https://docs.python.org/3/library/stdtypes.html#list" class="external-link"><code>list('some string')</code></a>
@@ -789,7 +789,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution4" aria-expanded="false" aria-controls="collapseSolution4">
   <h4 class="accordion-header" id="headingSolution4">Show me the solution</h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p>The program prints <code>m</code>.</p>
 <ol style="list-style-type: decimal"><li>Python interprets a negative index as starting from the end (as
@@ -833,7 +833,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution5" aria-expanded="false" aria-controls="collapseSolution5">
   <h4 class="accordion-header" id="headingSolution5">Show me the solution</h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
 <div class="accordion-body">
 <p>The program prints</p>
 <div class="codewrapper sourceCode" id="cb27">
@@ -877,7 +877,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution6" aria-expanded="false" aria-controls="collapseSolution6">
   <h4 class="accordion-header" id="headingSolution6">Show me the solution</h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
 <div class="accordion-body">
 <div class="codewrapper">
 <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -926,7 +926,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution7" aria-expanded="false" aria-controls="collapseSolution7">
   <h4 class="accordion-header" id="headingSolution7">Show me the solution</h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
+<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
 <div class="accordion-body">
 <p>Program A prints</p>
 <div class="codewrapper">
@@ -985,7 +985,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution8" aria-expanded="false" aria-controls="collapseSolution8">
   <h4 class="accordion-header" id="headingSolution8">Show me the solution</h4>
 </button>
-<div id="collapseSolution8" class="accordion-collapse collapse" aria-labelledby="headingSolution8" data-bs-parent="#accordionSolution8">
+<div id="collapseSolution8" class="accordion-collapse collapse" data-bs-parent="#accordionSolution8" aria-labelledby="headingSolution8">
 <div class="accordion-body">
 <p>Program A prints</p>
 <div class="codewrapper">
@@ -1089,7 +1089,7 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/11-lists.html",
   "dateCreated": "2016-01-07",
   "dateModified": "2023-07-24",
-  "datePublished": "2024-01-16"
+  "datePublished": "2024-01-23"
 }
 
   </script><script>
diff --git a/12-for-loops.html b/12-for-loops.html
index c3e207608..e7489db69 100644
--- a/12-for-loops.html
+++ b/12-for-loops.html
@@ -1108,7 +1108,7 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
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   "dateCreated": "2016-01-07",
   "dateModified": "2023-05-02",
-  "datePublished": "2024-01-16"
+  "datePublished": "2024-01-23"
 }
 
   </script><script>
diff --git a/13-conditionals.html b/13-conditionals.html
index 7a3343a2a..243cafd89 100644
--- a/13-conditionals.html
+++ b/13-conditionals.html
@@ -1022,7 +1022,7 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/13-conditionals.html",
   "dateCreated": "2016-01-07",
   "dateModified": "2023-05-02",
-  "datePublished": "2024-01-16"
+  "datePublished": "2024-01-23"
 }
 
   </script><script>
diff --git a/14-looping-data-sets.html b/14-looping-data-sets.html
index 919fab369..fd74092a5 100644
--- a/14-looping-data-sets.html
+++ b/14-looping-data-sets.html
@@ -770,7 +770,7 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/14-looping-data-sets.html",
   "dateCreated": "2016-01-07",
   "dateModified": "2023-05-02",
-  "datePublished": "2024-01-16"
+  "datePublished": "2024-01-23"
 }
 
   </script><script>
diff --git a/15-coffee.html b/15-coffee.html
index d3bf118d5..a42f78978 100644
--- a/15-coffee.html
+++ b/15-coffee.html
@@ -468,7 +468,7 @@ <h1>Afternoon Coffee</h1>
   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/15-coffee.html",
   "dateCreated": "2016-01-07",
   "dateModified": "2023-05-02",
-  "datePublished": "2024-01-16"
+  "datePublished": "2024-01-23"
 }
 
   </script><script>
diff --git a/16-writing-functions.html b/16-writing-functions.html
index 3cbb12824..242becfc1 100644
--- a/16-writing-functions.html
+++ b/16-writing-functions.html
@@ -613,7 +613,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution1" aria-expanded="false" aria-controls="collapseSolution1">
   <h4 class="accordion-header" id="headingSolution1">Show me the solution</h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb16">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -652,7 +652,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution2" aria-expanded="false" aria-controls="collapseSolution2">
   <h4 class="accordion-header" id="headingSolution2">Show me the solution</h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <div class="codewrapper">
 <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -721,7 +721,7 @@ <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution3" aria-expanded="false" aria-controls="collapseSolution3">
   <h4 class="accordion-header" id="headingSolution3">Show me the solution</h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li><p>The problem with the example is that the function
 <code>print_time()</code> is defined <em>after</em> the call to the
@@ -768,7 +768,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution4" aria-expanded="false" aria-controls="collapseSolution4">
   <h4 class="accordion-header" id="headingSolution4">Show me the solution</h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb25">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -811,7 +811,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution5" aria-expanded="false" aria-controls="collapseSolution5">
   <h4 class="accordion-header" id="headingSolution5">Show me the solution</h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
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 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb27">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
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   <h4 class="accordion-header" id="headingSolution6">Show me the solution</h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li><code>2003/2/1</code></li>
 <li>We saw examples of using <em>named arguments</em> when working with
@@ -957,7 +957,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution7" aria-expanded="false" aria-controls="collapseSolution7">
   <h4 class="accordion-header" id="headingSolution7">Show me the solution</h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
+<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb34">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1033,7 +1033,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution8" aria-expanded="false" aria-controls="collapseSolution8">
   <h4 class="accordion-header" id="headingSolution8">Show me the solution</h4>
 </button>
-<div id="collapseSolution8" class="accordion-collapse collapse" data-bs-parent="#accordionSolution8" aria-labelledby="headingSolution8">
+<div id="collapseSolution8" class="accordion-collapse collapse" aria-labelledby="headingSolution8" data-bs-parent="#accordionSolution8">
 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li>The average GDP for Japan across the years reported for the 1980s is
 computed with:</li>
@@ -1132,7 +1132,7 @@ <h3 class="callout-title">Simulating a dynamical system<a class="anchor" aria-la
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution9" aria-expanded="false" aria-controls="collapseSolution9">
   <h4 class="accordion-header" id="headingSolution9">Show me the solution</h4>
 </button>
-<div id="collapseSolution9" class="accordion-collapse collapse" data-bs-parent="#accordionSolution9" aria-labelledby="headingSolution9">
+<div id="collapseSolution9" class="accordion-collapse collapse" aria-labelledby="headingSolution9" data-bs-parent="#accordionSolution9">
 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li><div class="codewrapper sourceCode" id="cb43">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1305,7 +1305,7 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/16-writing-functions.html",
   "dateCreated": "2016-01-07",
   "dateModified": "2023-07-24",
-  "datePublished": "2024-01-16"
+  "datePublished": "2024-01-23"
 }
 
   </script><script>
diff --git a/17-scope.html b/17-scope.html
index 21fa704c2..f4c6c3e77 100644
--- a/17-scope.html
+++ b/17-scope.html
@@ -634,7 +634,7 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
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   "dateCreated": "2016-01-07",
   "dateModified": "2023-05-02",
-  "datePublished": "2024-01-16"
+  "datePublished": "2024-01-23"
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diff --git a/18-style.html b/18-style.html
index c97177577..d218fc384 100644
--- a/18-style.html
+++ b/18-style.html
@@ -782,7 +782,7 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
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   "dateCreated": "2016-01-07",
   "dateModified": "2023-07-29",
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diff --git a/19-wrap.html b/19-wrap.html
index 41d52d2b8..6e7bff6a5 100644
--- a/19-wrap.html
+++ b/19-wrap.html
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   "dateCreated": "2016-01-07",
   "dateModified": "2023-05-02",
-  "datePublished": "2024-01-16"
+  "datePublished": "2024-01-23"
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diff --git a/20-feedback.html b/20-feedback.html
index 5fee64ea6..be786c4ab 100644
--- a/20-feedback.html
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@@ -486,7 +486,7 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
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   "dateCreated": "2016-01-07",
   "dateModified": "2023-05-02",
-  "datePublished": "2024-01-16"
+  "datePublished": "2024-01-23"
 }
 
   </script><script>
diff --git a/404.html b/404.html
index 0d1a6408a..7e54c6571 100644
--- a/404.html
+++ b/404.html
@@ -464,8 +464,8 @@ <h1>Page not found</h1>
   "url": "https://swcarpentry.github.io/python-novice-gapminder/404.html",
   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/404.html",
   "dateCreated": "2016-01-07",
-  "dateModified": "2024-01-16",
-  "datePublished": "2024-01-16"
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 }
 
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diff --git a/CODE_OF_CONDUCT.html b/CODE_OF_CONDUCT.html
index afa0c6a79..86788839c 100644
--- a/CODE_OF_CONDUCT.html
+++ b/CODE_OF_CONDUCT.html
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   "dateCreated": "2016-01-07",
   "dateModified": "2023-05-02",
-  "datePublished": "2024-01-16"
+  "datePublished": "2024-01-23"
 }
 
   </script><script>
diff --git a/LICENSE.html b/LICENSE.html
index 8859dc35c..0a4933818 100644
--- a/LICENSE.html
+++ b/LICENSE.html
@@ -505,7 +505,7 @@ <h1>Licenses</h1>
   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/LICENSE.html",
   "dateCreated": "2016-01-07",
   "dateModified": "2023-05-02",
-  "datePublished": "2024-01-16"
+  "datePublished": "2024-01-23"
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diff --git a/aio.html b/aio.html
index f48bb1ea4..c3432b7e9 100644
--- a/aio.html
+++ b/aio.html
@@ -4822,7 +4822,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution1" aria-expanded="false" aria-controls="collapseSolution1">
   <h4 class="accordion-header" id="headingSolution1">Show me the solution</h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <p>The selection can be done by using the labels for both the row
 (“Serbia”) and the column (“gdpPercap_2007”):</p>
@@ -4868,7 +4868,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution2" aria-expanded="false" aria-controls="collapseSolution2">
   <h4 class="accordion-header" id="headingSolution2">Show me the solution</h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <p>No, they do not produce the same output! The output of the first
 statement is:</p>
@@ -4927,7 +4927,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution3" aria-expanded="false" aria-controls="collapseSolution3">
   <h4 class="accordion-header" id="headingSolution3">Show me the solution</h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>Let’s go through this piece of code line by line.</p>
 <div class="codewrapper sourceCode" id="cb32">
@@ -5009,7 +5009,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution4" aria-expanded="false" aria-controls="collapseSolution4">
   <h4 class="accordion-header" id="headingSolution4">Show me the solution</h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <p>For each column in <code>data</code>, <code>idxmin</code> will return
 the index value corresponding to each column’s minimum;
@@ -5047,7 +5047,7 @@ <h3 class="callout-title">Practice with Selection<a class="anchor" aria-label="a
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution5" aria-expanded="false" aria-controls="collapseSolution5">
   <h4 class="accordion-header" id="headingSolution5">Show me the solution</h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
 <div class="accordion-body">
 <p>1:</p>
 <div class="codewrapper sourceCode" id="cb38">
@@ -5112,7 +5112,7 @@ <h3 class="callout-title">Many Ways of Access<a class="anchor" aria-label="ancho
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution6" aria-expanded="false" aria-controls="collapseSolution6">
   <h4 class="accordion-header" id="headingSolution6">Show me the solution</h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
 <div class="accordion-body">
 <p>1. Access a single column:</p>
 <div class="codewrapper sourceCode" id="cb42">
@@ -5298,7 +5298,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution7" aria-expanded="false" aria-controls="collapseSolution7">
   <h4 class="accordion-header" id="headingSolution7">Show me the solution</h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
+<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
 <div class="accordion-body">
 <p>Among many choices, <code>dir()</code> lists the
 <code>median()</code> function as a possibility. Thus,</p>
@@ -6173,7 +6173,7 @@ <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution1" aria-expanded="false" aria-controls="collapseSolution1">
   <h4 class="accordion-header" id="headingSolution1">Show me the solution</h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb22">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -6208,7 +6208,7 @@ <h3 class="callout-title">How Large is a Slice?<a class="anchor" aria-label="anc
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution2" aria-expanded="false" aria-controls="collapseSolution2">
   <h4 class="accordion-header" id="headingSolution2">Show me the solution</h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <p>The list <code>values[start:stop]</code> has up to
 <code>stop - start</code> elements. For example,
@@ -6254,7 +6254,7 @@ <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution3" aria-expanded="false" aria-controls="collapseSolution3">
   <h4 class="accordion-header" id="headingSolution3">Show me the solution</h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <ol style="list-style-type: decimal">
 <li>
@@ -6305,7 +6305,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution4" aria-expanded="false" aria-controls="collapseSolution4">
   <h4 class="accordion-header" id="headingSolution4">Show me the solution</h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p>The program prints <code>m</code>.</p>
 <ol style="list-style-type: decimal">
@@ -6353,7 +6353,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution5" aria-expanded="false" aria-controls="collapseSolution5">
   <h4 class="accordion-header" id="headingSolution5">Show me the solution</h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
 <div class="accordion-body">
 <p>The program prints</p>
 <div class="codewrapper sourceCode" id="cb27">
@@ -6399,7 +6399,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution6" aria-expanded="false" aria-controls="collapseSolution6">
   <h4 class="accordion-header" id="headingSolution6">Show me the solution</h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
 <div class="accordion-body">
 <div class="codewrapper">
 <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -6448,7 +6448,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution7" aria-expanded="false" aria-controls="collapseSolution7">
   <h4 class="accordion-header" id="headingSolution7">Show me the solution</h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
+<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
 <div class="accordion-body">
 <p>Program A prints</p>
 <div class="codewrapper">
@@ -6507,7 +6507,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution8" aria-expanded="false" aria-controls="collapseSolution8">
   <h4 class="accordion-header" id="headingSolution8">Show me the solution</h4>
 </button>
-<div id="collapseSolution8" class="accordion-collapse collapse" aria-labelledby="headingSolution8" data-bs-parent="#accordionSolution8">
+<div id="collapseSolution8" class="accordion-collapse collapse" data-bs-parent="#accordionSolution8" aria-labelledby="headingSolution8">
 <div class="accordion-body">
 <p>Program A prints</p>
 <div class="codewrapper">
@@ -8498,7 +8498,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution1" aria-expanded="false" aria-controls="collapseSolution1">
   <h4 class="accordion-header" id="headingSolution1">Show me the solution</h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb16">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -8537,7 +8537,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution2" aria-expanded="false" aria-controls="collapseSolution2">
   <h4 class="accordion-header" id="headingSolution2">Show me the solution</h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <div class="codewrapper">
 <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -8612,7 +8612,7 @@ <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution3" aria-expanded="false" aria-controls="collapseSolution3">
   <h4 class="accordion-header" id="headingSolution3">Show me the solution</h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <ol style="list-style-type: decimal">
 <li><p>The problem with the example is that the function
@@ -8661,7 +8661,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution4" aria-expanded="false" aria-controls="collapseSolution4">
   <h4 class="accordion-header" id="headingSolution4">Show me the solution</h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb25">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -8704,7 +8704,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution5" aria-expanded="false" aria-controls="collapseSolution5">
   <h4 class="accordion-header" id="headingSolution5">Show me the solution</h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb27">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -8768,7 +8768,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
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 <p>Learners often struggle here, many may not work with financial data
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 <p>The selection can be done by using the labels for both the row
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-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
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 <div class="accordion-body">
 <p>No, they do not produce the same output! The output of the first
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 <p>Let’s go through this piece of code line by line.</p>
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 <p>For each column in <code>data</code>, <code>idxmin</code> will return
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 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
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 <div class="accordion-body">
 <p>1:</p>
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-<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
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 <div class="accordion-body">
 <p>1. Access a single column:</p>
 <div class="codewrapper sourceCode" id="cb42">
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-<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
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 <div class="accordion-body">
 <p>Among many choices, <code>dir()</code> lists the
 <code>median()</code> function as a possibility. Thus,</p>
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index e946461cc..ed686584c 100644
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 <p>The list <code>values[start:stop]</code> has up to
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 <ol style="list-style-type: decimal"><li>
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 <p>The program prints <code>m</code>.</p>
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 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
 <div class="accordion-body">
 <p>The program prints</p>
 <div class="codewrapper sourceCode" id="cb27">
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diff --git a/instructor/13-conditionals.html b/instructor/13-conditionals.html
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diff --git a/instructor/15-coffee.html b/instructor/15-coffee.html
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--- a/instructor/15-coffee.html
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 <ol style="list-style-type: decimal"><li><p>The problem with the example is that the function
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 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
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 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
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 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li><code>2003/2/1</code></li>
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-<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
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 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li>The average GDP for Japan across the years reported for the 1980s is
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index ccb0185f1..ce94e19f9 100644
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index c0a2760b3..5bccf43f6 100644
--- a/instructor/LICENSE.html
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index c244fc144..ff8c8756c 100644
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 <p>Learners often struggle here, many may not work with financial data
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+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <p>The selection can be done by using the labels for both the row
 (“Serbia”) and the column (“gdpPercap_2007”):</p>
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+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <p>No, they do not produce the same output! The output of the first
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 <div class="accordion-body">
 <p>Let’s go through this piece of code line by line.</p>
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 <div class="accordion-body">
 <p>For each column in <code>data</code>, <code>idxmin</code> will return
 the index value corresponding to each column’s minimum;
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 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
 <div class="accordion-body">
 <p>1:</p>
 <div class="codewrapper sourceCode" id="cb38">
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 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
 <div class="accordion-body">
 <p>1. Access a single column:</p>
 <div class="codewrapper sourceCode" id="cb42">
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-<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
+<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
 <div class="accordion-body">
 <p>Among many choices, <code>dir()</code> lists the
 <code>median()</code> function as a possibility. Thus,</p>
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   <h4 class="accordion-header" id="headingSolution1">Show me the solution</h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb22">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -6242,7 +6242,7 @@ <h3 class="callout-title">How Large is a Slice?<a class="anchor" aria-label="anc
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution2" aria-expanded="false" aria-controls="collapseSolution2">
   <h4 class="accordion-header" id="headingSolution2">Show me the solution</h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <p>The list <code>values[start:stop]</code> has up to
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@@ -6288,7 +6288,7 @@ <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution3" aria-expanded="false" aria-controls="collapseSolution3">
   <h4 class="accordion-header" id="headingSolution3">Show me the solution</h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <ol style="list-style-type: decimal">
 <li>
@@ -6339,7 +6339,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
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   <h4 class="accordion-header" id="headingSolution4">Show me the solution</h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p>The program prints <code>m</code>.</p>
 <ol style="list-style-type: decimal">
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 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
 <div class="accordion-body">
 <p>The program prints</p>
 <div class="codewrapper sourceCode" id="cb27">
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-<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
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 <div class="accordion-body">
 <div class="codewrapper">
 <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
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   <h4 class="accordion-header" id="headingSolution7">Show me the solution</h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
+<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
 <div class="accordion-body">
 <p>Program A prints</p>
 <div class="codewrapper">
@@ -6541,7 +6541,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution8" aria-expanded="false" aria-controls="collapseSolution8">
   <h4 class="accordion-header" id="headingSolution8">Show me the solution</h4>
 </button>
-<div id="collapseSolution8" class="accordion-collapse collapse" aria-labelledby="headingSolution8" data-bs-parent="#accordionSolution8">
+<div id="collapseSolution8" class="accordion-collapse collapse" data-bs-parent="#accordionSolution8" aria-labelledby="headingSolution8">
 <div class="accordion-body">
 <p>Program A prints</p>
 <div class="codewrapper">
@@ -8537,7 +8537,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution1" aria-expanded="false" aria-controls="collapseSolution1">
   <h4 class="accordion-header" id="headingSolution1">Show me the solution</h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb16">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
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   <h4 class="accordion-header" id="headingSolution2">Show me the solution</h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <div class="codewrapper">
 <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -8651,7 +8651,7 @@ <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"><
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   <h4 class="accordion-header" id="headingSolution3">Show me the solution</h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <ol style="list-style-type: decimal">
 <li><p>The problem with the example is that the function
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   <h4 class="accordion-header" id="headingSolution4">Show me the solution</h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb25">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -8743,7 +8743,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
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   <h4 class="accordion-header" id="headingSolution5">Show me the solution</h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb27">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -8807,7 +8807,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution6" aria-expanded="false" aria-controls="collapseSolution6">
   <h4 class="accordion-header" id="headingSolution6">Show me the solution</h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
 <div class="accordion-body">
 <ol style="list-style-type: decimal">
 <li><code>2003/2/1</code></li>
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 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution7" aria-expanded="false" aria-controls="collapseSolution7">
   <h4 class="accordion-header" id="headingSolution7">Show me the solution</h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
+<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb34">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -8977,7 +8977,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
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   <h4 class="accordion-header" id="headingSolution8">Show me the solution</h4>
 </button>
-<div id="collapseSolution8" class="accordion-collapse collapse" data-bs-parent="#accordionSolution8" aria-labelledby="headingSolution8">
+<div id="collapseSolution8" class="accordion-collapse collapse" aria-labelledby="headingSolution8" data-bs-parent="#accordionSolution8">
 <div class="accordion-body">
 <ol style="list-style-type: decimal">
 <li>The average GDP for Japan across the years reported for the 1980s is
@@ -9086,7 +9086,7 @@ <h3 class="callout-title">Simulating a dynamical system<a class="anchor" aria-la
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution9" aria-expanded="false" aria-controls="collapseSolution9">
   <h4 class="accordion-header" id="headingSolution9">Show me the solution</h4>
 </button>
-<div id="collapseSolution9" class="accordion-collapse collapse" data-bs-parent="#accordionSolution9" aria-labelledby="headingSolution9">
+<div id="collapseSolution9" class="accordion-collapse collapse" aria-labelledby="headingSolution9" data-bs-parent="#accordionSolution9">
 <div class="accordion-body">
 <ol style="list-style-type: decimal">
 <li><div class="codewrapper sourceCode" id="cb43">
@@ -9928,8 +9928,8 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
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   "dateCreated": "2016-01-07",
-  "dateModified": "2024-01-16",
-  "datePublished": "2024-01-16"
+  "dateModified": "2024-01-23",
+  "datePublished": "2024-01-23"
 }
 
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diff --git a/instructor/design.html b/instructor/design.html
index 54148857d..8fb6c2c96 100644
--- a/instructor/design.html
+++ b/instructor/design.html
@@ -942,7 +942,7 @@ <h3 id="finish-1630">Finish (16:30)<a class="anchor" aria-label="anchor" href="#
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   "dateCreated": "2016-01-07",
   "dateModified": "2023-05-02",
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diff --git a/instructor/discuss.html b/instructor/discuss.html
index dd9ee88bd..2382f8553 100644
--- a/instructor/discuss.html
+++ b/instructor/discuss.html
@@ -449,7 +449,7 @@ <h1>Discussion</h1>
   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/instructor/discuss.html",
   "dateCreated": "2016-01-07",
   "dateModified": "2023-05-02",
-  "datePublished": "2024-01-16"
+  "datePublished": "2024-01-23"
 }
 
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diff --git a/instructor/exercises.html b/instructor/exercises.html
index e4ccfcd1d..ed8d5a109 100644
--- a/instructor/exercises.html
+++ b/instructor/exercises.html
@@ -449,7 +449,7 @@ <h1>Further Exercises</h1>
   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/instructor/exercises.html",
   "dateCreated": "2016-01-07",
   "dateModified": "2023-05-02",
-  "datePublished": "2024-01-16"
+  "datePublished": "2024-01-23"
 }
 
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diff --git a/instructor/images.html b/instructor/images.html
index cb3c97637..d27837dfc 100644
--- a/instructor/images.html
+++ b/instructor/images.html
@@ -617,8 +617,8 @@ <h3 id="09-plotting-figure-12">Figure 12</h3>
   "url": "https://swcarpentry.github.io/python-novice-gapminder/instructor/images.html",
   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/instructor/images.html",
   "dateCreated": "2016-01-07",
-  "dateModified": "2024-01-16",
-  "datePublished": "2024-01-16"
+  "dateModified": "2024-01-23",
+  "datePublished": "2024-01-23"
 }
 
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diff --git a/instructor/index.html b/instructor/index.html
index 2b5032032..f82dfae19 100644
--- a/instructor/index.html
+++ b/instructor/index.html
@@ -653,8 +653,8 @@ <h3 class="callout-title">Prerequisites<a class="anchor" aria-label="anchor" hre
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   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/instructor/index.html",
   "dateCreated": "2016-01-07",
-  "dateModified": "2024-01-16",
-  "datePublished": "2024-01-16"
+  "dateModified": "2024-01-23",
+  "datePublished": "2024-01-23"
 }
 
   </script><script>
diff --git a/instructor/instructor-notes.html b/instructor/instructor-notes.html
index 0c7c0a67f..8ed8912eb 100644
--- a/instructor/instructor-notes.html
+++ b/instructor/instructor-notes.html
@@ -578,8 +578,8 @@ <h3 id="08-data-frames-headingInstructor1">
   "url": "https://swcarpentry.github.io/python-novice-gapminder/instructor/instructor-notes.html",
   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/instructor/instructor-notes.html",
   "dateCreated": "2016-01-07",
-  "dateModified": "2024-01-16",
-  "datePublished": "2024-01-16"
+  "dateModified": "2024-01-23",
+  "datePublished": "2024-01-23"
 }
 
   </script><script>
diff --git a/instructor/key-points.html b/instructor/key-points.html
index 0d9b60781..29a398015 100644
--- a/instructor/key-points.html
+++ b/instructor/key-points.html
@@ -708,8 +708,8 @@ <h2 class="accordion-header" id="flush-headingTwelve">
   "url": "https://swcarpentry.github.io/python-novice-gapminder/instructor/key-points.html",
   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/instructor/key-points.html",
   "dateCreated": "2016-01-07",
-  "dateModified": "2024-01-16",
-  "datePublished": "2024-01-16"
+  "dateModified": "2024-01-23",
+  "datePublished": "2024-01-23"
 }
 
   </script><script>
diff --git a/instructor/profiles.html b/instructor/profiles.html
index 2fe32067f..a60fe00ad 100644
--- a/instructor/profiles.html
+++ b/instructor/profiles.html
@@ -405,8 +405,8 @@ <h1>Learner Profiles</h1>
   "url": "https://swcarpentry.github.io/python-novice-gapminder/instructor/profiles.html",
   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/instructor/profiles.html",
   "dateCreated": "2016-01-07",
-  "dateModified": "2024-01-16",
-  "datePublished": "2024-01-16"
+  "dateModified": "2024-01-23",
+  "datePublished": "2024-01-23"
 }
 
   </script><script>
diff --git a/instructor/reference.html b/instructor/reference.html
index c5c8bca49..1809d02c0 100644
--- a/instructor/reference.html
+++ b/instructor/reference.html
@@ -840,7 +840,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/instructor/reference.html",
   "dateCreated": "2016-01-07",
   "dateModified": "2023-08-19",
-  "datePublished": "2024-01-16"
+  "datePublished": "2024-01-23"
 }
 
   </script><script>
diff --git a/key-points.html b/key-points.html
index 6aae14110..fcf3d0a03 100644
--- a/key-points.html
+++ b/key-points.html
@@ -704,8 +704,8 @@ <h2 class="accordion-header" id="flush-headingTwelve">
   "url": "https://swcarpentry.github.io/python-novice-gapminder/key-points.html",
   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/key-points.html",
   "dateCreated": "2016-01-07",
-  "dateModified": "2024-01-16",
-  "datePublished": "2024-01-16"
+  "dateModified": "2024-01-23",
+  "datePublished": "2024-01-23"
 }
 
   </script><script>
diff --git a/pkgdown.yml b/pkgdown.yml
index 5f164b74e..5355b7c48 100644
--- a/pkgdown.yml
+++ b/pkgdown.yml
@@ -2,5 +2,5 @@ pandoc: 2.19.2
 pkgdown: 2.0.7
 pkgdown_sha: ~
 articles: {}
-last_built: 2024-01-16T00:09Z
+last_built: 2024-01-23T00:10Z
 
diff --git a/profiles.html b/profiles.html
index 42cd22f96..8b2b709ac 100644
--- a/profiles.html
+++ b/profiles.html
@@ -405,8 +405,8 @@ <h1>Learner Profiles</h1>
   "url": "https://swcarpentry.github.io/python-novice-gapminder/profiles.html",
   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/profiles.html",
   "dateCreated": "2016-01-07",
-  "dateModified": "2024-01-16",
-  "datePublished": "2024-01-16"
+  "dateModified": "2024-01-23",
+  "datePublished": "2024-01-23"
 }
 
   </script><script>
diff --git a/reference.html b/reference.html
index 758b80581..f42996ed5 100644
--- a/reference.html
+++ b/reference.html
@@ -838,7 +838,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/reference.html",
   "dateCreated": "2016-01-07",
   "dateModified": "2023-08-19",
-  "datePublished": "2024-01-16"
+  "datePublished": "2024-01-23"
 }
 
   </script><script>