Jordan Rosenfeld

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.

Thanks to binding her ribs in tight corsets, Guinness World Record holder Cathie Jung has a waist that is the same circumference as a jar of mayonnaise.

We know chemistry when we feel it, but we don't always know why we're drawn to one person over another. Science has some answers … but not all of them.

While there are plenty of obvious pleasures of smooching, there are also some remarkable health benefits, backed by science.

B.F. Skinner is responsible for the term "positive reinforcement." He also taught pigeons to play ping pong—for science. Learn more about this pioneering psychologist.

We only think about our intestines when we have intestinal pain, or when something else goes wrong. But scientists are finding intriguing links between your gut, brain, and other systems.

Whether you bow down to the ritual of a mid-afternoon siesta or never stop to snooze, you may think twice about the power of napping after reading about its many benefits.