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TIL Elvis Presely hated John Lennon because of his anti-war stance

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EVD7 TIL the Thirteen Club met in the 1880s to debunk the superstition about the number 13 by dining 13 to a table, walking under ladders, and spilling salt on Friday 13th. They had 5 US Presidents as members, Chester Arthur, Grover Cleveland, Benjamin Harrison, William McKinley and Theodore Roosevelt.
wL8ZE TIL that the military salute comes from when medieval knights used to raise their visors so that senior officers would recognise them, and developed from there.
Me5Z0 TIL that children who have been in foster in care in the US have higher rates of PTSD than war veterans. Even children who have been abused/neglected fare better if they've remained in their homes than if they've been placed in foster care.
epm0E TIL the UK is the only country to have successfully developed and then abandoned the capability to launch satellites into space. The Black Arrow rocket launched the Prospero satellite into orbit from Australia in Oct 1971. The project was cancelled that same year due to cost.
neQ0o Today I learned that when you eat pineapple and your tongue begins to hurt it is due to the fact that the pineapple is eating you back thanks to bromelain.