It's strange when you come to think of it that despite human beings being living creatures of flesh and blood, the aspects that define our outward appearance - hair, skin, nails - are all dead. They have something else in common. They are all based on the wonderfully versatile compound, keratin.
And that's the subject of my latest Royal Society of Chemistry compounds podcast. So if you've 5 minutes to spare take a listen and discover the wonder of keratin.