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TIL that the word “silly” changed meaning over time from “happy” to “blessed”, “pious,” “innocent”, “harmless,” “pitiable”, and then “weak” before reaching the current meaning.

Read more etymonline.com

via reddit.com

R7mO9 TIL about Precordial Catch Syndrome (AKA Texidor's Twinge), which is when someone gets a sharp stabbing pain in the side of their chest for a few moments, then it disappears with no lasting effects. Why this happens is unclear
E1wR7 TIL the first concentration camp in Nazi Germany was used for communists, socialists, and other political prisoners.
7pr7 TIL Jackie Chan used to carry multiple guns and even a grenade to protect himself and other artists from the triad in the 80s and 90s
dD778 TIL the sound a whip makes when you crack it is caused by a sonic boom created when the tip of a whip moves faster than the speed of sound. The whip was also the first man made object to break the sound barrier.
EmJW TIL one of the top 10 most secure places in the world is a unique multi-storey car park in Derby, England. The architect designed it in response to his car window being broken and his stereo stolen. Other entries in the top 10 include Fort Knox, Air Force One, and Saddam Hussein’s Baghdad bunker