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TIL that Copenhagen's only ski hill, CopenHill, was built on top of one of the world's cleanest waste incineration plants

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via reddit.com

8eLNP TIL that if your SSN was issued before 2011 it reveals where you lived when you got your number. The first 3 digits correspond to a specific state.
PYBWE TIL about Izecksohn's Brazilian treefrog (Xenohyla truncata), the only known frugivorous frog species. It feeds on fruit, seeds, pods, pulp flowers and arthropods. It locates the fruit and simply snaps it, swallowing it whole. They eat insects just like any other frog when fruits are unavailable.
grZKL TIL about Ken Warby, the fastest man on water. He set the speed record in his homemade, wood boat in 1978 at 317.6mph (551.1 km/h), a record that still stands today.
rLn4 TIL the Swiss Guard, known now as the guys in the vibrant clown-like costumes that stand around the Vatican holding halberds, once stood against an army as it sacked Rome. 189 Guard stood against 20,000 invaders at the Vatican long enough for Pope Clement VII to escape the city.
WkRo8 TIL in the USSR, there was a course where every student was required to assemble an AK47 under a time limit in order to graduate from high school (начальная военная подготовка).