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 ...

Fatty acids are the building blocks of the fat in our bodies and in the food we eat. During digestion, the body breaks down fats into fatty acids, which can then be absorbed into the blood. Fatty acid ...

Reproduction is the process by which organisms make more organisms like themselves. But even though the reproductive system is essential to keeping a species alive, unlike other body systems, it's not ...

What Does the Immune System Do? If you've ever wondered how your immune system works, this movie is for you!

How Can We Prevent Fires? Always be aware of possible fire hazards in your house or apartment. To prevent fires, keep these tips in mind: According to the National Fire Prevention Association (NFPA), ...

Testicular torsion is an emergency condition. It happens when the spermatic cord, which provides blood flow to the testicle, rotates and becomes twisted. The twisting cuts off the testicle's blood ...

Vaping is the inhaling of an aerosol (mist) created by an electronic cigarette (e-cigarette) or other vaping device. E-cigarettes (often called vape pens) are battery-operated vaping devices that heat ...

What's the Urinary System? And What's Pee? You drink, you pee. But urine is more than just that drink you had a few hours ago. If you've ever wondered where pee comes from, this movie has the answers!

Walking pneumonia is a less serious form of the lung infection pneumonia. It's often caused by bacteria called Mycoplasma pneumoniae, but other bacteria or viruses can also cause it. Most kids with ...

You might go to the hospital if you fall off your bike and break your arm or if you have asthma and have trouble breathing. You might go to the hospital if you become dehydrated and need IV fluids or ...

You've probably heard countless times how exercise is "good for you." But did you know that it can help you feel good too? Getting the right amount of exercise can rev up your energy levels and even ...