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TIL Gray wolves were reintroduced into Yellowstone National Park in 1995, resulting in regeneration of the entire ecosystem [Trophic cascade]. After the wolves were driven extinct regionally nearly 100 years ago, scientists began to fully understand their role in the food web as a keystone species.

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Lkm8Q TIL according to a 2001 study, sponsored by the BBC, France 3 and Discovery Channel, Jesus's skin would have been more olive-colored than white or black, and that he would have most likely looked like a typical Galilean Semite of his day.
Zyr4 TIL serial killer Carl Panzram would rape his male victims not because he was homosexual but because he wanted to establish dominance over them.
D1oOv TIL that when the Japanese emperor announced Japan's surrender in WW2, his speech was too formal and vague for the general populace to understand. Many listeners were left confused and it took some people hours, some days, to understand that Japan had, in fact, surrendered.
mx8Jp TIL of the law of urination, it states that all mammals take roughly 21 seconds to empty their bladders regardless of size
VMR5G TIL surgically cropping a dog's ears or docking its tail can artificially alter the way dogs communicate with other dogs and humans. These procedures can have a significant impact on how dogs communicate and interact for the rest of their lives.