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TIL, There is a rare blood group known as ‘h/h’ or ‘Oh’ which was first discovered in 1952 at Mumbai, India (Formerly Bombay), hence christening another name ‘Bombay Blood Group’. This blood is so rare that only 4 in a million would have it globally; however, every 1 in 10,000 have it in Bombay.

aVZZ TIL Dr. Bernice Eddy warned the NIH that the polio vaccines they were about to release contained live polio virus. They ignored her and released the vaccine anyway, and as a result 40,000 children developed polio. The NIH director who dismissed Dr. Eddy then resigned.
PZaO TIL that Joseph Smith was killed by an angry mob while incarcerated. Smith had tried to suppress a local that had exposed Smith’s practice of polygamy - implying that he used his religion as a pretext to seduce and marry unassuming women - including the wives of some of his closest associates
VMR5G TIL surgically cropping a dog's ears or docking its tail can artificially alter the way dogs communicate with other dogs and humans. These procedures can have a significant impact on how dogs communicate and interact for the rest of their lives.
d8vLQ TIL Lèse-majesté is a French term meaning "to do wrong to majesty", is an offence against the dignity of a reigning sovereign or against a state. In Iceland for example, it can be punished by up to two years of imprisonment. For a very serious breach, the term can be extended to 6 years.
9wDvX TIL when Guinness World Records stopped monitoring the record for the longest time to stay awake in 1997, the record holder at the time was Robert McDonald who went 453 hours 40 minutes (18 days 21 hours 40 minutes) without sleeping in 1986.