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TIL a plant hopper (Issus coleoptratus) is the first species found to have functional biological gears

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woK87 TIL that 51% of births are male because female fetuses are more likely to die during pregnancy
oBkpR TIL: The Great Pyramid was once encased in limestone and would have appeared perfectly smooth and blindingly white.
ZpbYv TIL that Elliot Roosevelt, son of president Franklin Delano Roosevelt, wrote a series of mystery novels featuring his own mother Eleanor as a detective.
oavL TIL that Roman Emperor Augustus witnessed a man attempt to feed a slave to lamprey eels as a punishment for breaking a cup. Augustus freed the slave and had the rest of the man’s cups broken.
ElgX TIL a 2006 trial of an autoimmune drug that was found to be safe in mice, caused human volunteers fingers and toes to die within minutes of taking it and left them with multiple organ failures.