melanin

When you go out in the sun, melanin in your skin gets right to work.

X-rays show link between several elements and colorful markings

Devour the power!

Short answer: Skin protects itself, hair doesn't.

And could provide a new treatment for skin conditions

Researchers have successfully tested a technique that uses melanin-coated nanoparticles to protect bone marrow from damage commonly sustained during radiotherapy

Palms tan slightly but never become as dark as our shoulders, for instance, regardless of the amount of light they receive.