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TIL a pricing dispute over bamboo poles led to a war that killed 21 million people

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ADJdw TIL Charles Darwin predicted the existence of the giant hawkmoth 20 years earlier which was eventually discovered in 1882. He was 5,700 miles away then as he sat in his London office inspecting an unusual Star-of-Bethlehem orchid sent by a colleague.
xVWMk TIL about the traffic-inducing game of “leapfrog” played between truck drivers, where they get points for accumulating “bugs” (car drivers) stuck behind them as they do their “leap” in the left lane past the other trucks. The record is a 57-bug trail of cars stuck behind the leaping truck for 29 min
VMbV4 TIL people really do have a "type" when it comes to romantic attraction. According to a study, 50% of people’s preferences for faces is unique to them, and who we find attractive is most strongly influenced by our life experiences.
9YXV6 TIL Bhutan is the worlds only carbon negative country, every year it removes more carbon from the atmosphere than it produces. It achieved this by powering itself from hydroelectricity, banning log exporting, and amending it’s constitution to legally protect its forested area from dropping below 60%
OEN4 TIL a flock of passenger pigeons 1 mi (1.5 km) wide and 300 mi (500 km) long was once spotted in southern Ontario. The flock took 14 hours to pass overhead and held in excess of 3.5 billion birds.