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TIL Paralympic medals from Rio rattle. A different sound depending whether its Bronze, Silver or Gold to help blind athletes

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b9rrp Coronavirus closure returns Yosemite to the animals
jR5j TIL That the USA is the number one oil producing country in the world.
KOaoE TIL of a Russian analog computer built in 1936 that ran by a careful manipulation of water through a room full of interconnected pipes and pumps
J7w1 TIL that soldiers erroneously believed that the Ace in a pack of Bicycle playing cards was a symbol of death to the Viet Cong army and would scatter them around the jungle.
E1AZW TIL that Sexual jealousy evolved to motivate 'mate guarding' for both sexes, according to evolutionary psychology. Males are motivated to ensure offspring is theirs and females to secure paternal care.