Discover 25 More Human Body Facts That Sound Impossible! From pain-free elbows to two uteruses, explore bizarre biological ...

Laid end to end, an adult's blood vessels could circle Earth's equator four times, with scientists estimating anywhere between 60,000-100,000 miles of blood vessels in the human body. Your heart ...

The heart is the body's hardest-working muscle. Whether you're awake or asleep, or exercising or resting, your heart is always at work. It pumps blood through arteries to deliver oxygen to organs and ...

Blood cells carry a deep evolutionary history. A new analysis suggests their earliest ancestors were macrophage-like cells inherited from single-celled life.

A study published in the journal Environment International finds traces of microplastic polymers in human blood. The sizes and shapes of polymers raise a serious concern over the possible risk of ...