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TIL There are actually multiple definitions of 'real'. In 1972, Nobel Prize winning theoretical physicists, John Clauser, Anton Zeilinger and Alain Aspect showed that the 'local realism' view of the universe is likely to be false. Meaning: the world exists only when you're looking at it.

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WkDNN TIL About a bunch of stuff because National Geographic has a huge library of short "101" videos
vP1g4 TIL The Tarzan Character Was Temporarily Removed From Disney Parks Because People Kept Pinching His Butt Cheeks
9YxM TIL there is an archive of all major live television network broadcasts from 9/11 as it happened. “We can only tell you what we know – there’s been some sort of explosion at the World Trade Center.”
KOyoa TIL that in 1921 private police in the US dropped bombs and mustard gas on a coal miners' camp when they went on strike for better working conditions
9YjXD TIL the Space Shuttle had a glide ratio of 4.5:1, which is only slightly better than a helicopter with an engine failure (4:1).