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TIL that purple became associated with royalty due to a shade of it named Tyrian purple, which was created using the mucous glands of Murex snails. Even though it smelled horrible, this pigment was treasured in ancient times as a dye because its intensity deepened with time instead of fading away.

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BgpKx TIL that the number of abs you have is genetic and varies from person to person. The number of abs you have depends on the number of rings of abdominal tissue that someone is born with, and some people can actually have 10-pack abs.
PkeE TIL Rabbits can actually see whats behind them without turning their heads. They have nearly 360° panoramic vision, allowing them to detect predators from all directions. They can see everything behind them and only have a small blind-spot in front of their nose.
VMo6D TIL Sweden was the first country to put a eugenic state into practice before WW2 and the first state that set up for racial biology, an estimated 63,000 women were sterilised who were deemed to not have ‘Aryan-like’ genes, it ended in 1973 and compensation has been paid since 2000 to any victims
GYJlj TIL the lifespan of blue whales is estimated by their earwax, which builds up in seasonal cycles somewhat like the rings of a tree.
WkPVA TIL the Tarahuma of the Sierra Madre Occidental have a reputation as incredible long distance runners. From 1992 to 1998, 35 Tarahumas ran in 8 ultra-marathons in the US. Most finished in the top 10 with 4 outright wins and 2 course records.