Your eyes see, but how does vision happen? Find out how the eyes and brain work together in this eye video.

Aunque no hayas tenido tu primera regla o período menstrual, podrías quedarte embarazada si mantienes relaciones sexuales. Esto se debe a algo llamado ovulación, que ocurre incluso antes de que ...

Most of us know that some teens cut. But cutting — using a sharp object like a razorblade, knife, or scissors to make marks, cuts, or scratches on one's own body — is just one form of self-injury.

Why Is Taking Care of My Teeth Important? Taking care of your teeth helps prevent cavities and gum disease. When you clean your teeth, you remove plaque (say: plak). It’s the clear stuff made of germs ...

It's easier to agree than disagree. But we can learn a lot from conversations where we don't see eye to eye — if we can listen and talk rationally, that is. Unfortunately, many us either shy away ...

What Do Substance Abuse and Addiction Mean? The difference between substance abuse and addiction is very slight. Substance abuse means using an illegal substance or misusing a legal substance.

Symptoms, inhaler, tonsillectomy — what do all those medical words mean? Check out our easy-to-read definitions.

What Is Diabetes? Diabetes happens when the body can't use glucose normally. Glucose is a type of sugar that comes from the food we eat. It's the main source of energy for all the body's cells.

Your body has a "highway" system that sends blood to and from your body parts. It's called the circulatory system and the roads are called arteries and veins. Arteries, which usually look red, carry ...

Every single person has a skeleton made up of many bones. These bones give your body structure, let you move in many ways, protect your internal organs, and more. It's time to look at all your bones — ...

What Does the Brain Do? And What Does the Nervous System Do? If you've ever wondered how your brain and nervous system work, this movie has the answers!

What's the Digestive System? Even before you eat, when you smell a tasty food, see it, or think about it, digestion begins. Find out how the digestive system works, from start to finish, in this video ...