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TIL those button-like things on some masks are for air to bypass filtration when exhaling

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pYRGp TIL Athletes Once Downed Champagne—and Strychnine—for Energy Boost
NEZN TIL Joy Division’s iconic “Unknown Pleasures” album image is a representation of the radio signals from the first reading of a pulsar in 1967
jQQ TIL that in most Nordic countries there are laws called “Every man’s rights” which state that it is legal to trespass, camp, fish and pick berries on public and private lands.
neL5B TIL: The International Space Station can store up to 2,205 lbs. of garbage before it is sent back to Earth or burned up on commercial transport during re-entry.
A6Rx TIL that since 1970, the polar bear population has more than doubled.