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TIL of the Lead Mask Case: the unsolved death of two men found on a hilltop wearing lead eye masks with no apparent injuries. A nearby notebook was found to contain the message '16:30 be at the specified location. 18:30 ingest capsules, after the effect protect metals await signal'

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Abdx TIL that Nylon is made by a reaction between two liquid components in which the Nylon can be continuously removed to form a string
oBBQR TIL that in 2005, an interactive real-world game called Perplex City was created. It featured different puzzle cards and was solved in 2007. However, one card remains unsolved. Card #256 shows a picture of a man with the message: "Find me." No one has found him to this day.
pA9O TIL that during the Cuban Missile Crisis, the captain of a Russian sub, not knowing whether war had broken out, decided to launch a nuclear torpedo. Vasila Arkhipov, the second-in-command, didn’t consent and convinced the captain to surface, preventing nuclear war.
JyVv TIL of a new birth control method for men that has had a 100% success rate in test subjects so far. Developed by an Indian doctor, it works similar to an ‘on off’ switch, and would afford countless families across the globe an incredibly cheap method to control the size of their families.
4XdWw TIL the US operates about 800 military bases and logistical facilities outside its sovereign territory -- more than any other nation. All the other foreign bases owned by countries together total about 30.