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TIL that until the early 1920s, most astronomers thought that the Milky Way contained all the stars in the Universe. Following the 1920 Great Debate between the astronomers Harlow Shapley and Heber Doust Curtis, observations by Edwin Hubble showed that the Milky Way is just one of many galaxies.

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kOaE1 TIL of Sessue Hayakawa, a Japanese actor who was one of the biggest stars in 1910s Hollywood while being an early sex symbol. After growing tired of playing stereotyped roles he created his own production company, helping improve public opinion on Asians, while making a staggering $2 million a year.
xVaXg TIL As thanks for their assistance in the second World War, the Dutch cross-bred a species of tulip to resemble the Canadian flag
9Y4Gm TIL that veterinarians have the highest suicide rate of all professions. Female vets are 3.5 times more likely to kill themselves than the general population.
E16px TIL 7yr old Tyler Moon walked 1km (0.6 miles) of forest to save his father’s life after their quad crashed. Tyler made the journey to get help despite his own injuries: two collapsed lungs filling with blood and seven broken ribs. He managed to alert help just in time before collapsing himself.
9YDgM TIL of Smoky, a Yorkshire terrier who helped save the lives of 250 soldiers in 1944