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TIL Light guns (like the one used in the NES “Duck Hunt” game) were invented and used in arcade games since the 1930s.

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OoMvX TIL Zebras are black with white stripes. It was previously believed that zebras were white animals with black stripes, since some zebras have white underbellies. Embryological evidence, however, shows that the animal's background color is black and the white stripes and bellies are additions.
b6x8E TIL of Juliana the Great Dane, who saved her family's lives twice and earned two Blue Cross Medals. First by urinating on an incendiary bomb that landed in the family's home during WW2, and the second by alerting the family when their shoe shop had caught fire
ADWGl TIL of Chesty Puller, the most decorated Marine in American history. He fought guerrillas in Haiti and Nicaragua and, as a senior officer, served with distinction in World War II and the Korean War. He's known for the phrase, "We're surrounded, that simplifies things."
N7LKe TIL After the final battle of the Appomattox Court House that ended the US Civil War, as Lee and Grant were finishing terms of surrender, Lee turned to Grant's aide, a Seneca named Ely Parker, and remarked "It is good to have one real American here." Parker replied, "Sir, we are all Americans."
VGM4 TIL that 1 in 200 US births are to mothers who report that they have never had sex. Relative to “non-virgin” mothers not only do these mothers report lower communication from their parents about sex/contraception, but they were also younger and more likely to have signed chastity pledges.