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TIL that the oldest football (soccer) ball dates back to 1540. It's half the size of a normal ball and was made from the bladder of a pig.

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via reddit.com

4kBlo TIL about Neils Bohr's Gunslinger Effect, which shows that for many competing actions (like two Western gunslingers drawing a gun) the reactor acts faster than the first actor
yQ9VV TIL that the 2016 Rio Olympics were a huge financial disaster for Brazil. A $12bn price tag for the venues without any real plan on how to continue has left facilities,used by legendary athletes just years ago, in disrepair. The aquatic center pictured is now drained and filled with dirty puddles
p84oQ TIL Sarah Jessica Parker's ancestor Esther Elwell was accused of being a witch in 1692 Salem when a young girl claimed to have seen her ghost strangling her neighbor. Esther's case never went to court and she escaped a tragic death by a matter of days, as Salem stopped trying witches 1 month prior.
PYRmV TIL of the Panjandrum, a weapon consisting of large wheels propelled by rockets and holding explosives. During final testing the rockets broke free in all directions, the wheels began chasing military observers, and admirals/generals were forced to dive into barbed wire. It was never used in battle.
K10J TIL With just one dose of the ibogaine hallucinogen and a psychedelic journey that can last days, heroin addicts, alcoholics and cocaine users have reportedly found themselves completely free from their cravings — with none of the usual withdrawal symptoms.