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TIL that the blue-ringed octopus' main venom (tetrodotoxin) is not produced by the animal itself, but is instead produced by bacteria that live in their salivary glands. Mothers will inject neurotoxin into their eggs to enable their babies to produce their own venom.

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p85k4 TIL the actor who played Chunk in Goonies is now a lawyer who represents Bong Joon-ho
KElE TIL if you polish an ancient sword that’s been used in battle, even a 2000 year old sword, it literally bleeds out the blood of the people it’s been used on, which “smells like a steak cooking”.
4goN TIL that some schools in the Southern United States still hold two separate, segregated proms- one for whites and one for blacks.
69YrX TIL that Inca Ruins in Sacsayhuamán - Peru was built in 14th Century with Limestone blocks those weight vary from 128 to 200 tonnes. These stones were moved from an estimated 35 away. Stones are so precisely spaced that a single piece of paper will still not fit between many of the them.
Bggge TIL that amphetamines' first clinical use was to relieve nasal congestion, under the trade name Benzedrine in 1934. It is now used in the treatment of ADHD and narcolepsy among other uses.