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TIL that around the year 1500, Leonardo da Vinci designed a robot. When these plans were found almost 500 years later and built according to Leonardo's specifications, the design worked perfectly.

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dOVK TIL: tradition says that when entering a house or any other building, samurais had to leave their katana with a servant, but the wakizashi (a shorter katana) could be worn at all times and places. This is why the wakizashi is often called the samurai’s side arm
8gJb TIL that there is a card game called Mao in which new players are told only “the only rule you may be told is this one”, which means that new players have to discover the rules by themselves. The aim of the game is to be the first to get rid of all the cards in his hands without breaking any rules.
kOM71 TIL German was the first language of the majority of households until the 1950s in Schaumburg (Illinois)
4XZg TIL that Canadian triathlete Simon Whitfield consoled a little girl who had been crying for him after he crashed, before tending to his injuries.
45Wb TIL the gender of crocodiles is determined not by genetics, but by the temperature in which the eggs are kept in during the incubation period.