An encyclopedic reference of strange-but-true stories compiled as a time capsule for future generations.

The Four-Color Map Problem (Entry 495.NU2653)

July 23, 201951 min
In which over a century of mathematicians are unable to solve a geometry problem straight out of a coloring book, computers provide their first ever math "proof," and Ken challenges John to map a donut. Certificate #28876. Learn more about your ad-choices at