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TIL: Because of the Pearl Harbor attack, 3 sailors suffered being trapped in their submarine for 16 DAYS before they died

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ZpYQv TIL that between the 9th and 12th centuries Dublin was a major centre for slave trading by the Vikings. Slaves were taken from places such as Ireland, Scotland, England and Spain. They were sold as far away as Iceland and Anatolia.
wojwW TIL a day on Mercury (a full rotation) takes twice as long (176 Earth days) as a year. A full revolution around the sun occurs every 88 Earth days.
OoPde TIL NY Rangers fan still chant "Potvin Sucks" at every game, against every team, even though Dennis Potvin retired from the NY Islanders in 1988.
GYaM7 TIL the inability to recognise faces is called Prosopagnosia (face blindness).
LkVvp TIL In 1997, the FDA rules governing pharmaceutical advertising changed, allowing companies to name their drug and what it's for, while only naming the most significant potential side effects. Nielsen estimates there's an average of 80 drug ads every hour on American television, up from 3 in 1996