« previous next »
« previous next »
 

Did you know?

Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.

Did you know?

More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.

Did you know?

Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.

Did you know?

Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.

Did you know?

Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.

The Common Pochard, Aythya ferina, is a medium-sized diving duck. The Common Pochard, Aythya ferina, is a medium-sized diving duck.
Colorectal cancer. The most common sites of tumor development are shown. Colorectal cancer. The most common sites of tumor development are shown.
Diverse living organisms share common chemical features Diverse living organisms share common chemical features
Common Factors Affecting Urinary PH Common Factors Affecting Urinary PH
Common Suffixes Cont. Common Suffixes Cont.
This ciliated protozoan is a Stentor. Stentor are common in freshwater lakes and rivers This ciliated protozoan is a Stentor. Stentor are common in freshwater lakes and rivers
Video: Heart sounds

For a complete list of videos, visit our video library