The Wallace–Bolyai–Gerwien theorem says that if you have two polygons of equal area, you can cut one into pieces, and then place them back together to form the second piece. Dima Smirnov and Zivvy Epstein made an interactive to demonstrate. Draw two shapes and watch the magic happen.
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Mapping the Most Common Races
Select one or more races for a quick comparison. Counties are colored by the most prevalent.
How the American Work Day Changed in 15 Years
The American Time Use Survey recently released results for 2018. That makes 15 years of data. What’s different? What’s the same?
Shifting Parent Work Hours, Mom vs. Dad
Articles about stay-at-home dads and parents with even work loads might make it seem like dads are putting in a lot of hours in the household these days. Are they? How do they compare to moms’ work hours?