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TIL that Acacia trees developped a defense response to giraffe browsing by increasing their thorn length, tannin production within leaves and airborne tannin release. This triggered a change in the giraffe's behaviour which adapted to move upwind and eat fewer leaves per trees.

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9Yy6M TIL in Germany killing a European hornet or nest has been illegal since January 1, 1987, with a fine up to €50,000
7rgMX TIL During World War 2, an edible explosive was created under the code name “Aunt Jemima”-it was a mixture of flour and the powdery explosive HMX. It could pass for flour and even be used in cooking. It was smuggled by Chinese guerrillas to bypass Japanese checkpoints.
jN8rp TIL that Caligula once tricked a man into buying 13 gladiators for the high price of 9 million Roman sesterces. He had been selling off some gladiators to replenish the Roman treasury, when he saw a man fall asleep at the auction. He told the auctioneer to consider each of the mans nods as a bid.
1mjP TIL Stephen King sells the rights to some of his short stories for $1 so that film students can use them to make movies. He calls them his ‘Dollar Babies.’
6EMPQ TIL the chainsaw was invented to help during difficult childbirth; it would be used to cut away parts of the pelvis to make space for the baby.