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TIL that One Ton of air conditioning is the amount of heat needed to melt 2000 pounds of ice in 24 hours. Before 1902, Ice Delivery companies measured the amount of cooling a space needed in “Tons of Ice”, and this terminology has carried through to today

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v1eVB TIL of the murder of Henryk Siwiak, on September 11, 2001. Shot and killed in Brooklyn, his murder is the only one recorded in NYC that day apart from the 9/11 attacks, and his death remains unsolved.
46PX TIL Grand Duchess Anastasia Nikolaevna was known for being a brat, even described by some as evil. When she was young she put a rock inside a snowball and threw it at her sister. Later in her teens she stuck her tongue out at the man who would order her assassination.
Rpww TIL the pre-Meiji Japanese government differentiated believers and non-believers of Catholicism by making them step on pictures of the Virgin Mary and Christ. Those found guilty were often executed by being thrown into a volcano
4XKwb TIL the "whistling" noise used to indicate bombs falling in movies and TV shows is almost always the wrong way round. Anyone underneath a bomb that made such a sound (only specific WW2-era bombs) would hear the pitch increasing as it got closer, not decreasing, due to the Doppler effect.
wLr06 TIL of Ken Banks, a Queensland man who set up a "retirement home" for birds who outlive their owners, at one count housing at least 1,600 birds including a cockatoo in its 90s. He prefers not to sell birds but rather swap with breeders or give birds to people after teaching how to care for them.