Merge pull request #523 from cknuepfer/516-object_vs_variable · datacarpentry/r-socialsci@1e5d11b

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[uninformative link text]: [here](https://stat.ethz.ch/R-manual/R-devel/library/base/html/Reserved.html)

[uninformative link text]: [here](https://www.tidyverse.org/)

[uninformative link text]: [here](https://tibble.tidyverse.org/)

[image missing alt-text]: fig/tidy-data-wickham.png

[image missing alt-text]: fig/tidyr-pivot_wider_longer.gif

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