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TIL Neolithic houses had doorways on the roof.

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WBmd TIL 6 Nasa recruits are living for a year under a 36ft in diameter x 20 ft tall dome in Hawaii, to simulate life on Mars. They must wear a spacesuit when outside the dome. Recruits are: A French astrobiologist, German physicist and 4 Americans (pilot, architect, journalist, soil scientist).
bj67 TIL Your immune system destroys at least one cell every day that would have become cancer if it lived
P1ZDw TIL that in the United States, certain types of firearms are legal to manufacture by unlicensed individuals for personal use. They are also unregulated in 35 states.
v4m8 TIL that a bank worker fell asleep on his keyboard’s number 2 button, causing him to transfer 222,222,222 euros on a transfer that should’ve been worth only 62 euros. A co-worker was later sacked for not spotting the error.
woENo TIL: According to the ICRC, taking and killing hostages is a war crime.