Every year, surgical tools are left in approximately 1,500 patients in the USA. Fatter patients are more prone to having a surgical tool left inside of them due to the additional amount of space in their bodies.

Sharks are capable of going at least 6 weeks without eating; the record observed in an aquarium is 15 months by a species of shark known as the swell sharks).

Because of the unusual shape of their legs, kangaroos and emus struggle to walk backwards.

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