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TIL that if a woman with a negative blood type is pregnant with a baby with a positive blood type, and it's the mother's second or subsequent pregnancy. Her body will develop antibodies that will fight the baby as if it were an infection.

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via reddit.com

OoPAY TIL a “son of a gun” used to mean a child born on a a naval ship of uncertain paternity (ie a soldier’s bastard).
E196w TIL in 1981, a German landlord evicted a tenant after they spread surströmming brine, the world's smelliest food, in the building's stairwell. When the landlord was taken to court, the court ruled in favor of the landlord after they demonstrated their case by opening a can inside the courtroom.
GPkE TIL that police can refuse to interview job applicants if they score too high on an intelligence test
gMZe4 TIL burning incense sticks causes lung irritation and can lead to mutations in bacterial cultures. Despite not being on par with cigarette smoke, incense smoke is much worse than other scented alternatives.
rRX0d TIL that Harrison Schmitt, an American geologist, retired NASA astronaut, and former U.S. senator, is often credited with capturing the famed photograph of the Earth know as The Blue Marble, and he personally collected rock samples that suggested the moon once processed an active magnetic field.