The new study showed that the frequency of people with dark skin was still high in parts of Europe until the Copper Age (also ...

A recent study observed sleeping participants' pupils during sleep, using a new method that could have implications for ...

Ever wondered what the most common eye colors are? Well, they might not be exactly what you expected them to be.

So, what was a third eyelid doing in a human? Most refer to such bits of tissue as vestigial. The word means a structure that ...

Inside the human eye, the retina is made up of several types of cells, including the light-sensing photoreceptors that ...