The largest organ in the body isn’t the lungs or the brain, but the skin. Our skin performs a vast array of functions for us, from protecting us from disease to helping us make friends.

Dr Monty Lyman, author of The Remarkable Life of The Skin (£20, Bantam Press), calls skin the ‘Swiss Army Organ’ because of all the tasks it carries out.

Monty talks to BBC Science Focus Online assistant Sara Rigby about what the skin is for, why vanity is good for you, and what kind of creatures inhabit our skin.

We now have more than 75 episodes of the Science Focus Podcast, each of which is still well worth a listen. Here are a few that you might find interesting:

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