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TIL Christopher Havens, a convicted murderer solves ancient math problem in prison. Taught himself higher math and solved the age-old math puzzle of number theory involving so-called continued fractions over which Euclid has already racked his brains. He then published the journal in January 2020.

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ny77 TIL during WW2, when the Russians retreated they usually destroyed most buildings suitable for command posts. However, they would often leave some large buildings intact, but only after lining the buildings with time bombs set to explode weeks later - to destroy entire German headquarters at once
na8G TIL that in the 1960s Nintendo manufactured a toy called Ultra Hand. made of criss-crossed plastic elements that enabled its user to pick up objects. It was very successful and helped save Nintendo from serious financial difficulties. Its inventor went on to create the Game Boy.
kJxVW TIL there is a circular island in Argentina, called El Ojo, almost 400 feet in diameter, floating in a slightly larger circular lake.
nexVo TIL 51% of senior executives in China are women. And out of the top 50 self-made female billionaires in the world, 28 are from China.
jNM6Q TIL that France’s former African colonies are still required to keep their financial reserves in a French bank earning 0.75% interest. Some call this a continuing colonial tax on the former colonies.