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TIL kangaroos lack the ability to move backwards. For this reason, the Australian army features the animals on their uniforms.

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LDvm TIL Balamurali Ambati graduated medical school at the age of 17 to become the world’s youngest doctor. He completed his undergraduate studies at the age of 13.
a8Yp0 TIL at the Mcdonald's Global Headquarters in Chicago, IL, they have a restaurant with menu items from all over the world that you can try...and a "Hamburger University"
OGBGX TIL that otters are considered apex predators. Giant otter are opportunistic, taking whatever species are most locally abundant. If fish are unavailable otters will hunt caimans (species related to alligators) and anacondas.
aw4kb TIL bats and dolphins evolved echolocation in the same way (down to the molécular level). An analysis revealed that 200 genes had independently changed in the same ways. This is an extreme example of convergent evolution.
wLkEY TIL the "Dog Days of Summer" doesn't have to do with dogs laying around during the hottest days of the year, but the location of Sirius in the night sky