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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NBA Players Traded, Historical Percentages
It seems like there’s been more player movement than usual over the years. Didn’t players used to play on a single team for the entirety of their careers?
Shifting Incomes for American Jobs
For various occupations, the difference between the person who makes the most and the one who makes the least can be significant.