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TIL that photoelectric cells (which effect explained by Einstein) switched the lights on during the exposition of Chicago from 1833. They were activated from photons coming from Acturus star ; those took 40 years to land there and were released from the star during the previous exposition
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whatilearned
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TIL due to rising yearly deaths in American football (18 in 1905, 26 by 1909) colleges in California switched their predominant game to rugby. By 1920 all colleges went back to American football. However, their expertise helped the USA win the rugby gold medal in the 1920 and 1924 Olympic Games
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whatilearned
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TIL William Wrigley Jr. began by selling soap and offered baking powder as an incentive to buy it. Finding the baking powder more popular, he switched to selling it instead and gave his customers gum as incentive. Again, he found that the gum was more popular and began to sell it instead.
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whatilearned
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