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5

TIL Canada officially switched to Metric on April 1st, 1975 with some citizens thinking it was an April Fool's joke and others protesting it. The Canadian Metric Commission was officially abolished in 1985, with most Canadians now using a mix of Imperial and Metric measurements in daily life.

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5Yllp TIL that Lee Richmond, the first Major League pitcher to throw a perfect game (in 1880) once had a physics professor explain to him that a curveball couldn't exist, and it was only an optical illusion. In response to this, Richmond invited the entire faculty to watch him pitch.
XE5Ak TIL hippopotamus can defecate so much in the water they're in, that fish start to die because the bacteria in the hippo's feces use up the majority of the oxygen contained in the river.
XEepE TIL throughout the 1970’s the Grateful Dead used a 32ft tall PA system that could deliver perfect sound 600ft away. It had to be hauled in caravans of semi trucks and took 4 hours to assemble. They called it “The Wall of Sound”.
E10wV TIL that when Canadian serial killer Wayne McGray was sentenced, he said “Just because I’m locked up in segregation doesn’t mean I can’t kill somebody”. Ten years into his sentence, he killed a cellmate.
XE9d6 TIL Darryl Strawberry, an MLB right fielder for 17 seasons, had such a bad sex addiction he would have sex between innings