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 Much Time We Spend Alone and With Others
Oftentimes what we’re doing isn’t so important as who we’re spending our time with.
Shifting Causes of Death
The most common causes of death changed over the years. They vary across sex and age group. This animation shows the details of these changes.