Home » Classic Riddles » Used to threaten, used to defeat. Sometimes it grows, sometimes it shrinks. Used to conquer, used to protect. It marks ...

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You’re stranded in a rainforest, and you’ve eaten a poisonous mushroom. To save your life, you need an antidote excreted by a certain species of frog. Unfortunately, only the female frog produces the antidote. The male and female look identical, but the male frog has a distinctive croak. Derek Abbott shows how to use conditional probability to make sure you lick the right frog and get out alive. How do you get out alive?

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Who can shave three times a day and still grow a beard?

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What demands an answer, but asks no question?

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