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TIL the patrol boats used by the United States Navy during the Vietnam War were powered by jets manufactured by Jacuzzi

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OoaX7 TIL that Native Americans started the practice of reloading bullet cartridges during the Indian Wars. US military authorities found out and ordered all US soldiers to stomp on their fires cartridges after being fired. Frontiersmen took advantage of this and sold overpriced shells to the natives.
n8od TIL that prior to 1993 the FDA banned women from participating in clinical trials. This resulted in a dangerous lack of awareness about how certain drugs impacted women and has led to misunderstandings about how certain diseases affect men and women differently that persist today.
P15en TIL that cannabis use can prevent nightmares caused by PTSD.
oRPgL TIL Sperm whales use babysitters. Sperm whale youths cannot dive as deep as their mothers so when the mother needs to forage in the deep the youth is kept safe by swimming with other adult whales.
16Re4 TIL Sigurd the Mighty, the Second Earl of Orkney who reigned between 875–892, was killed by by an infected wound after he strapped the decapitated head of Máel Brigte the Bucktoothed to his horse. The bouncing head and jaw chewed into Sigurd's leg on his victorious ride home from their fight.