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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How Many Kids We Have and When We Have Them
Many parents stop at two kids. Most are done by three. Still, everyone has their own timelines. Here are 1,000 of them.