« previous next »
« previous next »
 

Did you know?

Allergies play a major part in the health of children. The most prevalent childhood allergies are milk, egg, soy, wheat, peanuts, tree nuts, and seafood.

Did you know?

In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.

Did you know?

Studies show that systolic blood pressure can be significantly lowered by taking statins. In fact, the higher the patient's baseline blood pressure, the greater the effect of statins on his or her blood pressure.

Did you know?

Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.

Did you know?

According to animal studies, the typical American diet is damaging to the liver and may result in allergies, low energy, digestive problems, and a lack of ability to detoxify harmful substances.

The primary structure of ribonuclease The primary structure of ribonuclease
El Niño and areas of high marine primary production around the Galapagos Islands. Noti El Niño and areas of high marine primary production around the Galapagos Islands. Noti
The leaf is usually the primary site of photosynthesis in plants. The leaf is usually the primary site of photosynthesis in plants.
Stars vary widely in size. Stars vary widely in size.
Schools IN for Summer Schools IN for Summer
Carbon dioxide: The anthropogenic greenhouse gas of primary concern Carbon dioxide: The anthropogenic greenhouse gas of primary concern
Video: Gas exchange - driving force

For a complete list of videos, visit our video library