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TIL about the only surviving male defender of the Alamo, a slave of Col. William Travis named Joe.

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4kAnR TIL of David Hahn, the 17 yr old Who Built a Nuclear Reactor in His Garden in 1994
PYn5w TIL that beneath the city of Tokyo lies an ingenious water diversion system to minimize flooding in the city during typhoons. This world’s largest water channeling infrastructure can divert 200 tons of storm water per second into the Edo River.
6PQ8 TIL When asked what was the speed of sound Albert Einstein said: “[I do not] carry such information in my mind since it is readily available in books.”
E1WN7 TIL Hippopotamus Milk is Pink in Color. Hippopotamuses produce two unique skin secretions (so unique they're named after the animal), "hipposudoric acid" and its analog "norhipposudoric acid". It gives the hippopotamuses' sweat a red coloration, commonly believed to be blood (it's not).
pYeDO TIL John Wojtowicz, who unsuccessfully tried to rob a bank in 1972 to pay for his wife Eden's gender reassignment surgery. Wojtowicz had based his plans on the movie, "The Godfather" (1972), which he had watched earlier that day