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TIL most toilets flush in E-flat.

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b9pLa TIL, in 1948, a man wore 30-pound, 3-toed lead shoes and stomped around a Florida beach in the night. The footprints lead people to believe that a 15-foot tall penguin was roaming their lands. He kept up the prank for 10 years, visiting various beaches. The hoax wasn't revealed until 40 years later.
dp5Z TIL Transparent glass solar panels are already a reality
waxE TIL Engineers used to rely on imprecise calculations with slide rules that only showed three decimal points but designed the Empire State Building, Saturn V rocket with them. As a result, they designed conservatively by making walls thicker and bridges stronger than needed
p8kyb TIL 90% of the Earth's gravity reaches the ISS, and the reason the crew float in the spacecraft is due to "microgravity". In a vacuum like outer space, objects of any weight, fall at the same speed. Since astronauts and the spacecraft are falling together (around Earth), they appear to be floating.
8YrZ TIL that ‘hella’ was a proposed SI prefix for one octillion (1,000,000,000,000,000,000,000,000,000).