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TIL when Charles Darwin first discovered the Galapagos Tortoises he tried to ride them

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ZpyyY TIL that if you were able to fold a sheet of paper in half, over and over, after 103 folds that piece of paper would larger than the whole observable universe.
0dkoN TIL about the Reversing Falls, on the Saint John River in Canada that reverses direction twice a day at high tide.
R7wo4 TIL of Jeff Erlanger (1970-2007), who was a quadriplegic child who appeared on an episode of Mister Rogers' Neighborhood in 1981. Almost 20 years later, when Rogers was inducted into the Television Hall of Fame in 1999, Erlanger was a surprise guest to introduce him.
jNmaE TIL that until the mid 20th century the avocado had a reputation as an aphrodisiac, which actually discouraged some consumers. During the 1920s, growers sponsored a promotional advertising campaign in the United States to deny that the avocado had powers for inducing sexual prowess.
9w5dr TIL Christopher Columbus used a lunar eclipse in 1504 to deceive Jamaican natives into providing supplies, claiming it was a sign of divine anger. The frightened natives complied, unaware of the eclipse's natural cause.