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TIL that an estimated 10-20% of young women in industrialized countries have a contact allergy to nickel

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Lk1M0 TIL some people have a fourth cone in their eyes, allowing them to see an estimated 100 million extra nuances of color
m15Vx TIL that Zheng He (Cheng Ho) was a Muslim admiral who made seven diplomatic voyages to East Africa as far as Malindi (near Mombasa) between 1405 and 1433 during China's early Ming dynasty.
r8Ne TIL There was an intern who stole moon rocks from NASA, spread the rocks on his bed and had sex on them, resulting in contamination making the rocks virtually useless to the scientific community. He was sentenced for more than 8 years.
1OkP TIL that Ghengis Khan’s conquests killed so many people, it increased the oxygen in the Earth’s atmosphere.
8ewXa TIL Bram Stoker (of Dracula fame) also wrote a collection of children's stories. Critics of the time called them "morbid"