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TIL the U.S. military uses bees to find landmines

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BPYx TIL of La Mancha Negra, a mysterious black goo that oozes up from beneath Venezuelan roadways, killing drivers. Despite, much study, we have no idea what the goo is.
x6lA0 TIL that some metro stations in Bucharest have very narrow platforms, because Elena Ceausescu (the wife of Nicolae Ceausescu) wanted less stations in the metroline saying: "youth and working class is starting to get fat, so they need to walk more", so the workers had built those stations in secret.
pww4 TIL that the female spotted hyena is the only mammalian species to lack an external vagina, and gives birth through a pseudopenis. This penis is used for communication and can become erect.
Z8ZWG TIL that Alexander Fleming discovered penicillin, but never tried to make an antibiotic out of it. It was not until a decade later that a man named Howard Florey found Fleming's little-known paper and realized the mold's potential. Florey's work is estimated to have saved up to 200,000,000 lives.
4Zg6 TIL people’s teeth used to randomly explode in the 1800s due to bad fillings. Before the advent of mercury amalgam, a wide variety of metals were used to fill cavities. Using two different metals could create an electrochemical cell – effectively turning the whole mouth into a low-volt battery