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TIL about the "multi-dog experiment". In 1968, Demikhov transplanted a puppy’s head onto the neck of another dog. It was the first "two body-one circulation" system. This taboo experiment which was criticized a lot became the founding principle of the modern heart and lung transplant we have today.

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neAEY TIL early people would drink a ton of water before they went to bed if they knew they had to be up early. Their full bladder would rouse them before the sun rose, meaning that they could wake up before dawn. Native Americans also used this method, called over-drinking, well into the 20th century. 💧
XG5Q TIL When casting his first Star Wars film, George Lucas needed a tall actor who could fit the role of Chewbacca. This led Lucas on a search which turned up Peter Mayhew, who says that all he had to do to be cast in the role of Chewbacca was stand up.
dDynd TIL that The battle on ice, known as the 'ice massacre', is the only instance in history of a full-scale battle on a frozen lake, resulting in the Teutonic knights being dramatically defeated when the ice gave way beneath them under the weight of their armour
D6wp TIL the 9/11 tragedy released a cloud of asbestos fibers over NYC. 400 tons of asbestos was in the WTC building. An estimated 410,000 people were exposed to the toxic substance. Nearly 70% of rescuers have lung problems. Experts expect cancer diagnoses to peak in 2041-four decades after the attack.
VM9QB TIL Rust does not cause tetanus, it is just discarded metal tend to be left at places which also happens to have the bacteria that causes the disease.