THE BODY

The male sexual organ is more complicated than it might seem.

Humans are now known to have between 20,000 and 25,000 genes, but researchers still have much to learn about these small segments of DNA.

Without our immune system, we wouldn't last very long: this complex network of organs and cells fights off pathogens and helps maintain our health.

Taking in oxygen to power your whole body is just one part of your lung function. Altogether, your lungs are a highly efficient machine—and they do a lot more than you might think.

Not only is the liver your largest internal organ; it is in charge of hundreds of bodily processes ranging from fighting infection to manufacturing proteins and hormones to helping your blood clot.

It’s less than an inch in diameter.

René Descartes once described the pineal gland as “the principal seat of the soul.” Medical knowledge has vastly progressed since his time, though. Here’s what we know about this critical organ.

You might think they’re unnecessary, because so many people have had their tonsils removed—but tonsils actually serve an important role in your immune system.

Barring some dramatic medical advancements, living into your eighties remains the best-case scenario.

Many people underestimate the damage that suppressing a sneeze can cause.

The nagging pain in your neck may feel tight, but it's knot what you think.

Fall just got more colorful for colorblind visitors to Virginia’s state parks.