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

Read more video.nationalgeographic.com

WyZo TIL Thanksgiving was moved in 1939 to the second-to-last Thursday (from the last Thursday) in November by FDR at the request of the president of Macy’s, to increase the number of shopping days before Christmas.
QNPk9 TIL That Richard Todd played Major John Howard, who lead the assault on 'Pegasus Bridge', in The Longest Day. Todd, a WW II veteran, participated in the actual battle and in one scene his character is relieved by another actor who is playing Todd himself.
mxMQO TIL in the UK at any one time, there is an average of 3.8 billion genuine banknotes in circulation, with a notional face value of around £75 billion.
Rng6 TIL The Vatican has an astronomical department staffed with Jesuits and runs one of the worlds largest telescopes called LUCIFER located in Arizona
rmx TIL that a rapist fooled DNA tests by surgically implanting a tube filled with blood in his arm and tricking the laboratory technician into having a blood sample taken from it