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TIL: The government of North Korea assigns every citizen a social class based on the political, social, and economic background of their direct ancestors as well as the behavior of their relatives. Descendants from wealthy families (pre-revolution) are given the lowest status.

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Y5L7 TIL killer whales that prey on other mammals enter ‘stealth mode’ when hunting, not making any sounds until the prey has been caught. Killer whales that prey on fish, however, continue to make noise at all points in their hunting since fish can’t hear the frequencies they use
rGPM TIL someone actually raised his son to speak Klingon as a first language. The boy ultimately stopped responding to his father, forcing him to abandon the “project” after 5 years.
W7o8B TIL Christiaan Huygens was one of the first astronomers to apply mathematical principles to the design of optics rather than trial and error, and his telescope could study Saturn's ring system. The Huygenian eyepiece he invented in the 17th century is still in use today
ne9Md TIL a man in 2002 found a way to crack the lottery in the US state of Michigan using math and probability. He figured out that if he bought a certain amount of tickets that he would certainly make a profit. He and his wife Marge ended up making millions of dollars.
wLpN7 TIL Duke Nukem Forever was actually already 90% complete in 2001. But because the Unreal Engine 1 used for the game made levels turning black, and other conflicts with textures. So the studio scrapped all those finished works, and start all over again