For most of the 20th century, the model of human origins was a tree: with the trunk dividing into branches, and then twigs.

Hair, nails, and horns, all made up of keratin, are some of the hardest and most resilient structures in animals. Inside zebrafish cells, keratin plays a distinct role, giving them the strength they ...

Brain size and bipedalism are the most likely drivers of our species’ right-hand dominance, according to new research ...

Humans are overwhelmingly right-handed, but scientists have long struggled to explain why no other primate species shows ...

Sooner or later, we all contend with graying hair. But what causes strands of hair to lose pigment and, in some cases, regain ...

How can you get gray hair in your 20s? Well, now, I’m 29, and I catch little gray hairs sprouting from my roots often, no ...

For most of human history, green eyes didn’t exist. Understanding why they do now means rethinking what we know about ...

The nightmare that jolts you awake at 3 a.m. isn’t a malfunction. It may be one of the oldest survival systems in the human ...

A newly identified region on Mars may hold the key to future human landings. Researchers found evidence of water ice less than a meter beneath the surface, close enough to be harvested for water, ...

A hantavirus outbreak on a cruise ship in the Atlantic Ocean has raised questions about how the rare, often fatal illness could have spread among passengers and crew, and whether it may continue to ...

The outbreak on the MV Hondius has been linked to three deaths and eight suspected cases of the Andes strain of hantavirus Vanessa Etienne is a Staff Writer for PEOPLE on the Health team. She joined ...