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TIL of Operation Monopoly, which was a covert plan by the FBI to build a secret tunnel underneath the Soviet Embassy in Washington, D.C. to gather secret intelligence. It was largely a technical failure and was compromised by FBI double agent Robert Hanssen to the Soviets.

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8e80K TIL that black and white film can be developed using instant coffee and sodium carbonate, a process called “Caffenol”, instead of utilizing traditional developing chemicals.
ga8 TIL That the male spiders Sexual organ works faster as well as more efficiently when it is detached by the female thus killing the male, It’s called the eunuch phenomenon
RV56 TIL the Soviet Union built the world’s first laser tank. (x-post from /r/TankPorn).
Jw6m TIL that a small portion of the population can voluntarily control their tensor tympani muscle, causing a low rumble in the ear.
x6Ep0 TIL that the .com TLD was originally operared by the US Department of Defense, and still falls under US Jurisdiction.