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TIL MIT engineers made the first-ever plane with no moving parts by using electricity to ionize air (2018).

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6EJdY TIL that most of the 9/11 hijackers had no idea that they were on a suicide mission. Evidence shows that the majority likely believed that they were taking the planes hostage as a means of leveraging the release of Al-Qaeda prisoners. Only the men trained to fly the planes knew the truth.
rQKw TIL Romanian sewer workers accidentally discovered a cave which was sealed for 5.5 million years. Movile Cave is filled with evolutionary distinct exotic creatures (albino crabs, worms) which feed off sulfur-producing bacteria
4XGL6 TIL that a tech billionaire is investing in tiny robots, DNA reprogramming, and artificial blood because he believes these technologies will enables humans to live to at least till 125 years old
R7YJl [TIL] some people are born with extra "thorn" bones in the side of their feet
J1818 TIL the sitcom Maude had unusual style episodes for its time, including several episodes featuring only 2 characters, and one episode where Maude is speaking to an unseen psychiatrist, and is the sole actor in frame the entire episode