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TIL of Cherophobia. A condition where one fears that being happy can invoke sadness.

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m1XEP TIL the exercise paradox: hunter-gatherers who trek miles daily (or climb up trees) burn the same calories as much-less-active office workers and machine operators
Wk4m4 TIL that all SI base units of measurement are written in lowercase, except for those named after people, Kelvin and Ampere
b6OD0 TIL gravity is not 9.8 m/s2 around the world. That is just the global average.
PPAE TIL The actor for Darth Vader (David Prowse) learnt all of Vader’s lines and acted as Vader in the films only for all his lines to be dubbed over by James Earl Jones because Prowse sounded like “some Scottish guy”.
wLxVP TIL of 'Project 100,000.' 25% of US Army soldiers in the Vietnam were intentionally-recruited "misfits" who couldn't read and write, had an IQ of below 75, and/or dropped out of high school. Some didn't even know the US was at war. They had 3x the casualty rate of regular soldiers.