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TiL the human brain can generate enough electricity to power a small light bulb.

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8agP8 TIL Zardoz is a film about flying stone heads, barbarians, eternal life, a vortex, renegades, Beethoven’s 7th & Sean Connery as “Zed” learning to read & saving humanity in a red speedo, knee-high leather boots & pony tail
OoEng TIL that in 1987 students from Caltech changed the Hollywood sign to read CALTECH
OGyZ1 TIL about the British post office scandal. Between 1999 and 2015 over 900 subpostmasters where prosecuted for theft and false accounting, when really it was a problem with their accounting software.
eprQ6 TIL that Robinson arithmetic is a system of mathematics that is so weak that it can't prove that every number is even or odd. But it's still strong enough to represent all computable functions and is subject to Godel's incompleteness theorems.
oKv8 TIL The word “niggard” is not etymologically related to the word “nigger” and it has no racial connotations, yet people still get shit for using it because it sounds similar to the racial slur.