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TIL that clapperboards are used to synchronize audio and video captured in separate devices

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kxG7 TIL that the Hubble Telescope’s mirrors are ground so precisely that if they were scaled up to be the size of Earth, the largest bump would be 6 inches tall.
1aZ8W TIL the phrase the “Bees Knees” likely evolved around the 1920s along with the “cats pajamas,” the snake's hips", "the kipper's knickers" and "the sardine's whiskers" unlike the others though Bees actually do have Knees (go
KgB4 TIL that 11% of people are stupid enough to use 1234 as their PIN, and approximately 26.83% of PIN’s could be guessed within 20 attempts by using things like 1111, 2222, 1000 etc.
Wk9Xo TIL that under anti-discrimination laws, bartenders cannot legally refuse serving alcohol to pregnant women
D1GWr TIL lightning strikes are several times more likely to reach the ground in colder climates compared to the tropics