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TIL an episode of Mythbusters where the myth of a sugary cereal's box being more healthy than the cereal itself was was tested but never aired. This was due to the fact that the lab mice that were fed the cereal box wound up eating each other during filming.

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WkggY TIL That the Jim Varney character 'Ernest P Worrell' was originally used by an ad agency to sell everything from orange juice to air conditioners.
6E5dX TIL while humans produce vitamin D by exposing their skin to sunlight, cats and dogs must ingest their own fur as a source of their vitamin D. This is the reason why they love to lay in the sun and groom themselves (probably because it feels good too)
by59 TIL the scent given off by each person’s unique immune system is the second-most important criteria (after disposition) women use to assess potential partners. Women are more likely to find people attractive who have with immune systems unlike their own.
kJg7e TIL that in December 1577 St. John of the Cross—A Catholic saint—was actually kidnapped by his fellow Carmelites, held in a tiny prison cell, beaten weekly and fed only bread and water for nine months before escaping.
690Mw TIL Neptune is not blue in colour, instead it's pale greenish-blue, as is Uranus. The original photos of Neptune taken by Voyager 2 in 1980s had been enhanced to highlight it's atmospheric features. Over time the captions of this changes were left out and blue became the defining colour of Neptune.