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TIL Australia is the only country in the world to have significant net positive immigration with the US. That is, more people leave the US for Australia than vice versa.

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DQAov TIL When colored vinyl 45's were introduced in 1949, the colors indicated what type of music was on the 45.
Ok1R TIL a National Geographic photographer (Arctic specialist) felt “true love” for, and nurtured by, a 1000 lb. leopard seal that could “kill you in an instant” He spent 4 days in the water with her while she continually tried to feed him penguins. (On the link story starts around 51 minutes in)
dDYor TIL the Atlantic Pygmy Octopus drills a hole into crustacean shells in order to inject them with paralyzing venom
J1QJ1 TIL only 40 dog breeds and varieties were known in 1873, whereas today, around 400 breeds are recognized by the Fédération Cynologique Internationale alone.
5Vd1D TIL that Rube Goldberg never actually built a Rube Goldberg Machine, they were bi-weekly comic strips. It was other people who built his designs and other such machines.