T he heart is the body's hardest-working muscle. Whether you're awake or asleep, or exercising or resting, your heart is ...

In an email to io9, biological anthropologist Nina Jablonski — an expert on the evolution of human skin — explains that follicle density is highest on the scalp and lowest on the back, chest ...

Most people have 24 ribs, with 12 on each side of the body. No evidence indicates any difference between males and females. The ribs and rib cage are excellent examples of the human body’s ...

When bullets enter a human body, they don’t just pierce tissue, they shatter bones and dislocate limbs. Full Episode. ... General surgeons operate on the torso and chest wounds.