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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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D1ebg TIL in 1920, The New York Times ridiculed Robert H. Goddard and claimed that rockets could not function in space. On July 17, 1969, a day after the Apollo 11 launch, NYT formally acknowledged their error
GYjX4 TIL The only White Giraffe on the planet is found in Kenya and is fitted with a GPS system to detect poachers
OGGB1 TIL About an ACE German pilot who spared and escorted a badly crippled American B-17 bomber to safety. Later both pilots found each other after WWII and became friends until they passed.
jN7wE TIL that human hair can be used to accurately measure relative humidity in the air. Human hair hygrometers have been in use since the 18th century.
oRYOr TIL that heirs to the throne of the Ottoman Empire were kept under house-arrest in the "Cage" from puberty until death (or becoming sultan), and it was common for a new sultan to have his brothers killed, including infants, sometimes dozens at once, to reduce the number of claimants to the throne.