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TIL about SubTropolis, a giant former limestone mine under Kansas City that was converted into the world’s largest underground business complex. The 1,100-acre complex is accessed through tunnels, and as of 2015, 1,600 people worked there.

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ne1bG TIL in the 1960s the US had developed a nuclear bomb small enough to be carried by one person, such as a paratrooper, and placed at an enemy target such as bridge, dam, etc.
oRJ4o TIL the discoverer of the coelacanth, naturalist Marjorie Courtenay-Latimer, had to fight with the taxi driver, the museum curator, the morgue director (it was summer), and the cold storage supervisor. Then the taxidermist botched the job, and the photo film fell into the mud and got destroyed.
QN0nk TIL I learned that california has a bill called prop 47, that allows you to do some crimes, and it be a misdemeanor instead of a felony, as long it's not over $950, or below it (this was due to overcrowed prisons)
XEZpD TIL Vlad the Impaler once repelled an attempted Ottoman invasion by making a forest of wooden stakes piled high with Ottoman corpses. According to Chalkokondyles, a contemporary Greek historian, there were over 20,000 people in his "Forest of the Dead"
Pvdg TIL a Russian billionaire named Dmitry Itskov is working on a project known as the 2045 initiative with the end goal of it being to create a complete working model of a persons brain and putting in a robotic body with the hopes of completing it by 2045.