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TIL that the first tiger shark to hatch inside it's mother's uterus eats all the other embryos, and at least one scientist has been bitten by unwisely sticking a finger in a pregnant tiger shark's uterus

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via reddit.com

VO6Z TIL Director Oliver Stone enlisted in the U.S. Army during the Vietnam war and requested combat duty. He participated in more than 25 helicopter combat assaults. He was awarded the Bronze Star with “V” device for his heroism in ground combat, as well as a Purple Heart with an Oak Leaf cluster.
OGeb4 TIL Samantha Josephson mistakenly entered a wrong vehicle after ordering an Uber and was stabbed over 100 times in the backseat. She couldn't escape the vehicle because her assailant engaged the child lock mechanism for her doors. This incident sparked new laws and procedures to protect passengers.
D6lp TIL Lake Vostok, the 16th largest lake in the world, was only confirmed to exist in 1993. It’s located in Antarctica beneath a 4km ice sheet. The average water temperature is around −3 °C; it remains liquid below freezing point because of high pressure from the weight of the ice above it
beZE TIL The notion that ‘dude’ may have been derived as translating the Swahili word 'dude’ as “a thing of which you don’t know or have forgotten the name”.Purportedly, the locals described early missionaries to Africa as “dude”.
kJPDm TIL that flags fly at half-mast or half-staff to make room for an invisible flag of death to be flown above it.