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TIL a California liked to hike in a canyon occupied by a bear family. One day he was attacked by a mountain lion and was saved when the mother bear ran to his defense.

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JYRo4 TIL that For $45, the U.S. Bureau of Engraving and Printing will sell you a 5-lb bag with $10,000 worth of shredded U.S. currency.
kO7Ae TIL there is an English book on atomic theory that avoids all foreign loan words: elements become "firststuffs", hydrogen is "waterstuff", and the title, Uncleftish Beholding, means Atomic Theory
Wkvy8 TIL Melinda Liu not only saw this pandemic in 2017, but she, named the very town in China where it would originate.
gMYV8 TIL that bees and many other pollinating creatures can detect nectar in flowers by seeing UV colors that aren't visible to the human eye. Many flowers have UV patterns, or "landing zones", which bees use to direct them to the nectar in the flower.
Brgex TIL herd animals in the wild often hang around with giraffes. The giraffes, being so tall, give the herd animals such as Zebra and Wildebeest an early warning of lions sneaking up on them. These herd animals benefit by having friends in high places (quite literally).