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TIL Hay is a crop from grass, straw is a byproduct of grain production (the stems). Hay has more nutritional value for animal feed

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9YrPp TIL of Jolabokaflod, a Christmas Eve tradition in Iceland where friends and family get together to exchange books and then they all read them together while eating chocolate and drinking cocoa.
QgKa TIL Male bats perform oral sex on female bats (the only other species besides humans that have been observed doing this)
4XEMJ TIL that RH null is a blood so rare, only 40 people in the world have it. It's a universal donor among many people with other rare blood types, and as such has been called the "golden blood" because its life saving capability is enormous.
AN9rd TIL that the reason you get chills from a fever isn't because you're physically cold. It's the brain setting your body temp higher to fight the infection and tricking your body into thinking the temperature is wrong so the chills can help increase heat.
E1Qj0 TIL: Owning a cat can reduce the risk of heart attacks and strokes by more than a third.