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TIL About Greek Fire. An incendiary weapon developed by the Byzantines in the 7th century, it was deployed on ships, and in handheld tubes, operating similar to a flamethrower. Water didn’t extinguish it. Its precise chemical composition is still unknown.

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egyn TIL that the first person to discover sperm, Antonie van Leeuwenhoek, kept his discovery secret for 23 years out of fear of embarrassment.
e1GE TIL Katana produced during Japans feudal period are far superior to any other sword to come out of the country at any other time.
opJY TIL a high school kid once wrote 150 famous novelists to ask if they intentionally put symbolism in their work. 75 authors responded, including Bradbury, Asimov, Kerouac, Ayn Rand, and Updike.
Yp6PP TIL the episode of Seinfeld titled "The Revenge" when George quits his job and then shows back up to work as if nothing happened in hopes of keeping it was inspired by Larry David's real-life story of quitting his job as a writer at SNL and doing the same thing
69B8Z TIL that the first touchdown in the first Superbowl was made by Max McGee. A reduction in playing time due to injuries and age, he entered the Superbowl hungover as he did not expect to play in the game but when the starting receiver went down he was put in and scored a touchdown shortly after.