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TIL - Kangaroos don't have belly buttons. Marsupials and monotremes don't feed their unborn offspring via a placenta so have no umbilicus.

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Jj5Q TIL the political terms “left/right” come from seating arrangements in the French Assembly during the revolution: revolutionaries to the left, and monarchists to the right
16vl4 TIL There are fossilized plants in Greenland under 1.4 km of ice. At the bottom of a 1.4 km core sample, which was taken in 1966 at Camp Century, researchers found "well-preserved fossil plants and biomolecules," which means that the massive sheet melted and reformed at least once in the last millio
D1Nne TIL In 1929, W. Forssmann performed the first human heart cath on himself. He tricked the OR nurse, put himself under local anesthesia, inserted a catheter into his arm, then walked to the X-ray room to see if it reached his heart. He was fired from the hospital, but awarded the Nobel Prize in 1956.
R7OZQ TIL Breeder reactors are a type of nuclear reactor which produce more fissile materials than they consume. They are designed to extend the nuclear fuel supply for the generation of electricity, The concerns about nuclear weapons proliferation have been one large impediment to creating breeders.
7AXp TIL that there is a company that provides private flights for individuals who want to join the mile high club. For $425.00 you get a 1 hour flight, chocolate, champagne, a curtain and 1 VERY DISCREET PILOT