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TIL that the deepest hole ever drilled by humans is only about 7.5 miles deep. (The Earth is approximately 7,900 miles in diameter)

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WkxgX TIL that North Korea attempted to build a luxury hotel named the Ryugyong Hotel in 1987. This hotel is still under construction to this day. It is also the tallest unoccupied building in the world.
6Er0m TIL about the Costasiella kuroshimae (AKA "leaf slug" or "leaf sheep"), a species of sacoglossan sea slug that has the ability to retain the chloroplasts from the algae it feeds on and use them to photosynthesize its own energy.
xV05B TIL that, when threatened, the yellow-spotted millipede or Harpaphe haydeniana curls up into a ball and exudes hydrogen cianide on its predator, accompanied by the characteristic smell of toasted almonds, being lethal to rodents and birds. It uses chemical warfare on its victims!
l709K TIL The remains of the iconic train crash from the movie The Fugitive can still be found rusting along the Great Smoky Railroad as a tourist attraction in Dillsboro, North Carolina.
v1ln7 TIL John Snow's influence helped create the modern sewer system