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TIL about The Woman Without a Face who committed murders, petty theft, and explosive robberies across Europe. What linked them was DNA from the same unknown woman. Eventually, it was found that the DNA was from a worker at the factory that produced the cotton swabs the forensics team had been using.

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Vbpm TIL that there is a town in northern Kazakhstan where residents fall into a deep sleep for up to 6 days at a time. No abnormal radiation or gas levels have been detected and to this day, no one knows why.
KO6bJ TIL that there are four stages to learning a new skill: unconscious incompetence, conscious incompetence, conscious competence, and unconscious competence.
4YKa TIL that when the Soviet embassy in Ottawa, Canada caught fire. The Soviets tried to take out the fire themselves and not call the fire department. When the fire department arrived the Soviets would not let them in. Eventually, they let them in only after the Soviets removed sensitive documents.
NXn68 TIL domestic cats are one of the most prolific and deadly hunters on the planet. its estimated cats kill 2.4 billion birds per year in the US alone and in Australia they have helped drive at least 20 native species to extinction. They are such good hunters they are considered an invasive species.
kOEW7 TIL An assistant professor at Stanford created a hand powered paper centrifuge ($0.20 to make) and a paper-lense microscope($0.45-$0.55). Both helping to diagnose blood borne illnesses, such as malaria, in underdeveloped countries.