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National Geographic explorer Helle Olsen explains why mandrills have such colourful bums.

Read more video.nationalgeographic.com

D1p1P TIL The Scottish Highlands, and Appalachian Mountains in the Eastern US are a part of the same mountain chain
AWon TIL that in America you have to pay hundreds of dollars if you need an ambulance
J1AkB TIL Teddy Roosevelt's mother was the inspiration for Scarlet O'Hara in Gone With the Wind.
vZ9B TIL Someone created an ‘Assassination Market’ using Bitcoins as the payment method. The price to hit Ben Bernanke was the equivalent of $75,000.
RX7 TIL: Up to half of the world population is infected with Toxoplasmosis, a parasitical infection possibly linked to depression, anxiety and schizophrenia.