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TIL DHL delivers in North Korea

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OD6a TIL There are 6 mathematical problems still unsolved to this day. A correct solution to any one of the 6 will make you $1,000,000 richer. The 6 problems are often referred to as ‘The Millennium Prize Problems’.
4W5a TIL 4 skateboarders in Calgary stepped in to save a woman being sexually assaulted. They scared off the assailant, then chased him down and held him until police arrested him.
gM59A TIL that in 1986, when a murdered woman was found by her husband in their LA apartment, the LAPD considered the case a botched burglary. The woman’s father said that an old lover of his daughter’s husband-an LA cop, was the murderer. He was proven right by a DNA match over 20 years later.
0dP0R TIL That the often represented visual of the Jellyfish is their Ephyra or Medusa developmental stage. Before the Ephyra stage, it is attached to the ground and has a "stalk-like" structure. This is known as the Polyp stage.
8exeL TIL that hummingbirds are the only birds that can fly backward. They are also the only birds capable of hovering in the air for an extended period.