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TIL in 1941, Allied forces fought a successful delaying action against the invading Nazis at Thermopylae, the very spot where Spartans fought a successful delaying action against the invading Persians in 480 B.C.

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E1lmW TIL that Dynamite and TNT are actually different kinds of explosives, the former one having Nitroglycerin in its compounds. The common misconception of both being the same likely comes from pop culture references.
0dmA5 TIL that Kashmir has the world's only floating post office, located on Dal Lake in Srinagar. It was relaunched in August 2011 and also includes a museum within itself.
R7Qn9 TIL - The military did a study and found that 90% of more than 100 over the counter and prescription drugs were perfectly good to use after 15 years in storage.
QXP9 TIL NASA had to relabel the penis sleeve for urinating in space suits from “small, medium, and large” to “large, gigantic, and humungous” because astronauts would only choose the large and they kept slipping off.
GYWo5 TIL that Charles Manson’s mother once sold him to a woman for a pitcher of beer and then his uncle had to find the woman to get him back