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We never discuss why we fart, what snot is, or why phlegm is so bizarre, but today that changes as Adam Walton asks rude and embarrassing questions to find out how our bodies really work.

Joining Adam is Stefan Gates, the man behind ‘Rude Science Live,’ described as the naughtiest, funniest, and most revolting family science show in the world, and it's coming to Cardiff.

Produced by Stuart Russell.