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TIL there is a difference between medical signs and symptoms

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via reddit.com

rNOJM TIL the samurai sword, invented a millennium ago, was a marvel of beauty and engineering. The katana’s two different types of steel gave it optimum qualities to pierce and slash making it a highly versatile weapon in battle.
aLdy TIL in 2007, 17-year old Nataline Sarkisyan Died after Cigna Health Insurance denied a life-saving procedure, despite doctors pleas that she receive treatment.
rR5K4 TIL that Astronaut John Young smuggled a corned beef sandwich onto a space flight. The sandwich was dubbed the '30 million dollar sandwich"
5Ylw9 TIL that as many as 1 million Vietnamese people are disabled or have health problems as a result of U.S. use of Agent Orange in the Vietnam War. Nearly 20 million gallons of various herbicides and defoliants were sprayed over Vietnam between 1962 and 1971 by the U.S. military.
QNK9M TIL that chickens don't need males to lay eggs.