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TIL that when women become pregnant, their periods stop temporarily.

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via reddit.com

16JRd TIL when snowflakes hit water they create a screeching sound too high for humans (but not some sea animals) to hear. When a flake hits the water, an air bubble is released that oscillates in the 50-200 khz range well above a human's range. Snow hitting water can increase underwater sound by 30 db.
ADGQw TIL that the longest tennis match in history was played at Wimbledon in 2010. It was 11 hours and 5 minutes long, played over 3 days. The final set lasted 8 hours and 11 minutes-longer than the previous record. After, both players and the umpire were given a crystal bowl and champagne flutes.
neyGb TIL that in 2018 Philip Morris, the maker of Marlboro, created a campaign and paid a full-page ad saying its New Year resolution was to give up cigarettes and help those who can't quit smoking to change to better alternatives.
Bmad TIL you are required in Svalbard to carry a rifle when leaving a settlement, in order to fend off polar bears
LK5Q TIL that the ‘falling sensation’ and jerk reflex felt before sleep may go back to our ancestors having to re-adjust themselves when sleeping in trees, so they didn’t fall out.