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TIL Suchetha Satish, a 16 yr old, sang in 120 languages for 7 hours and 20 minutes straight, earning a Guinness World Record.

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b9NVN TIL that two cars crashing head-on at 50 mph is not comparable to one car hitting a wall at 100 mph. "Although the two-car crash doubles the speed, the energy [of] the crash is transferred to twice the mass resulting in a crash that looks like just one car hitting a wall at 50 mph."
mxWbp TIL of Ski Valley at Sangre de Cristo in New Mexico, which has "Tree Martinis" to calm the nerves of the skiers heading down the mountain.
4Xd4J TIL "red telephone", a direct line between DC and Moscow, isn't really a phone line and no phones were ever used. It went from teletype to fax machines. Since 2008, it's a secure form of email.
5YevR TIL On September 8, 2009, Sgt. Dakota Meyer disobeyed a direct order to pull back from his position so he could rescue wounded soldiers from a firefight a mile away. He ended up going back five times, saving the lives of 36 soldiers, saying “That’s what you do for a brother”.
grx74 TIL that a woman is born with all the eggs she'll ever need for conception.