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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What Makes People the Most Happy
It’s in the details of 100,000 moments. I analyzed the crowd-sourced corpus to see what brought the most smiles.
Who Makes More Money
Someone mentioned that $400,000+ per year was commonplace in American households. That seemed like an odd comment.