Scientists mapping the human body at the cellular level keep running into the same surprise: beneath the apparent chaos of ...

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 ...

A simple light-based method is uncovering hidden fiber networks inside the brain and body, even in tissue slides over 100 years old.