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TIL The vibrations and contractions of a cat's purr show a consistent pattern and frequency around 25 Hz; these frequencies have been shown to improve bone density and promote healing in animal models and humans.

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9YJoQ TIL The reason men have nipples is because foetuses grow as a female until the Y chromosome kicks in but by that time, the nipples have been created.
J4Vv TIL that the first king of Belgium was German, fought in the Russian army, married an English princess and had previously turned down the chance to become king of Greece.
4koXJ TIL that Alexander Bogdanov, a Russian scientist, experimented with blood transfusions from younger individuals for rejuvenation. He tragically died after transfusing blood from a student with malaria and tuberculosis, though the student miraculously recovered.
kZdE TIL that Jim Woodman theorized that the Nazca lines were built via an ancient form of flight. TO prove this he constructed a hot air balloon only using resources that were available to the ancient Nazca people.
QaWk TIL Sweden has state-sponsored, after-school music programs, which might explain why Swedish songwriters and producers were responsible for 25% of the Billboard Top Ten Hits last year