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TIL one of Jupiter’s moon’s, Io, is the driest thing and most geologically active object in the Solar System

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6Eo6Q TIL, in 2014, after Bieber's arrest for DUI, "Deport Justin Bieber and revoke his green card" received almost 275,000 signatures. Petitions with 100,000 signatures require an official White House response. However, the WH's response was, "Sorry to disappoint, but we won't be commenting on this one."
XEWoX TIL Fidel Castro was obsessed with Cow Genetics and Breeding. In 1982, he successfully bred Ubre Blanca, who broke the world record for most milk produced in one day. When the cow died in 1985, the State Media published a front page obituary and the postal service issued stamps in her honor.
l7Ee1 TIL the Soviet Buran space shuttle had turbojet engines for added control which enabled it to lift off from traditional runways for testing or transport
GYNa5 TIL guns can be fired in space. Gunpowder contains its own oxidizer, which allows guns to work even in the vacuum of space.
XVDr TIL that humans are the only living great ape species who have 23 pairs of chromosomes, all other species have 24 pairs.