To escape the grip of a crocodile's jaws, push your thumbs into its eyeballs - it will let you go instantly.

Odds of being killed by lightning? 1 in 2million/killed in a car crash? 1 in 5,000/killed by falling out of bed? 1 in 2million/killed in a plane crash? 1 in 25 million.

A full-grown tree produces enough oxygen to support a family of four.

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