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TIL that the content delivery network CloudFlare uses a wall of 100 lava lamps as a way to generate entropy for a random number generator

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GAk41 TIL. The marathon distance of 26.2 miles is not the distance between Marathon and Athens, but was established by the Queen of England for the 1908 Olympics.
P198g TIL Demodex mites, relatives of arachnids with chitin exoskeletons like crabs and scorpions live and sexually reproduce in the dark on 99% of human faces.
awOrZ TIL about the Battle for Castle Itter, where in the closing days of WWII a small group of Americans, French prisoners, a surrendered SS officer, and several Wehrmacht soldiers fortified an Austrian castle and held off a force of marauding SS soldiers.
Me6OV TIL that the 30 second ad on television was created after tobacco companies could no longer advertise (1971), that the 15 second ad was inspired by MTV (1984), and that the "unskippable" 5 second ad was created by Geico after research showed 94 percent of YouTube viewers skipped prerolled ads (2015)
epa9E TIL that Tour de France cyclists can eat up to 8000 calories per day averaging around 5000 daily. Three weeks, 21 stages, 3,351km, 176 cyclists and a combined burn of 25 million calories.