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TIL Camels first evolved in North America

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YpADZ TIL the Aztec capital Tenochtitlan was built on Lake Texcoco, which was engineered to segregate freshwater & saltwater with dikes to maintain a drinking water supply. The Spanish drained the lake to build Mexico City, resulting in water shortages. Mexico City sank 10m over the past century.
WkDAA TIL that on pianos dating from the 18th century when Mozart was alive, the colors of the keys was exactly reversed: the white keys were black and the black keys were white.
KRP6 TIL that the songs of blue whales have been becoming progressively deeper each year. There is no explanation for this mysterious voice change.
1RNW TIL that in 1914, at the summer home of architect Frank Lloyd Wright, a manservant at the residence became deranged, setting half the house ablaze; he then went on to murder seven people with an axe as the fires burned. Among the dead were Wright’s mistress and her 2 children.
Br4ry TIL the Netherlands has a government-sponsored YouTube series of young people trying different illegal drugs