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TIL “death crystals” are blue-green inclusions found inside of certain white blood cells in severely ill patients; after first being identified in a patient there is a 56% mortality rate within 2 weeks.

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dDjL7 TIL about Precordial catch syndrome, a phenomenon in which you get sporadic stabbing pains in the chest, which is harmless
YPkG TIL the first 1 million dollar budget movie in America (1916) also featured the first full female nudity in a mainstram film. It was a commercial success, but no copies of it exist. It is a lost movie.
VMxK8 TIL bears make a purring sound somewhat like a cat when they are comfortable or eating a special treat or, for young bears, nursing. They make tongue click sounds when they are approaching other bears to mate or play.
v1xnL TIL "Big Pool" in Garden City, Kansas, built in 1922, is the world's largest outdoor concrete municipal swimming pool. It holds over two million gallons of water and is so large people can water ski on it.
kO0D5 TIL there are numerous orca ecotypes spread across the globe. They don’t breed with other ecotypes and seldom interact with them.