Exercise changes your body in complex ways. Discover what happens to your muscles, heart, and mind when you start working out consistently over time.

How does the human body cope with the world’s highest peak? At Everest’s “death zone,” oxygen levels drop so low that cells start to die and thinking becomes foggy. Climbers risk brain swelling, fluid ...

A night-shift worker finishes at dawn. Their phone says Tuesday, but their body feels like it's Monday. The body's internal ...

If a pig embryo infused with human cells truly became something close enough to count as a member of the human species, then ...

One of the biggest mistakes you can make in life is believing that you know everything there is to know. Even if you’re ...

Researchers have uncovered that the body uses different molecular systems to sense cold in the skin versus internal organs.

Earth has the perfect combination of a livable atmosphere and a protective magnetic field that prevents the Sun's harmful radiation and radioactive solar winds from damaging us, allowing us to live on ...

Imagine driving a car with a steering that doesn't respond instantly and a GPS that always reflects where you were a second ...

For centuries, the nature of a fever — and whether it's good or bad — has been hotly contested. In ancient Greece, the physician Hippocrates thought that fever had useful qualities, and could cook an ...

It's better than the second film — bolder and tighter — and still has its share of amazements. But the series no longer feels ...

Let me start with a simple confession. I love good coffee, well-written books and the comfort of a nicely arranged home. For ...