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TIL Nikolai Tesla patented a one-way-valve with no moving parts in 1920 (Patent US1329559)

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X0gWj Til no child with type I diabetes survived until adulthood before 1922.
VM01p TIL that a 14 year old boy named John once impersonated an MI5 agent online and "recruited" his best friend into the secret services. The initiation test was to murder... John. John became the first person in the UK to be convicted for inciting his own attempted murder.
QNXo6 TIL that the ocean contains 352 quintillion gallons of water
xl17 TIL that Cincinnati has a subway system that most residents don’t even know about.
wL878 TIL: A viewer of "America's Most Wanted" called to report that he'd seen the kidnapped girl who was featured. The authorities investigated and found that while she wasn't the girl featured, she had been kidnapped years ago, and reunited her with her mother.