« previous next »
« previous next »
 

Did you know?

Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.

Did you know?

Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.

Did you know?

About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.

Did you know?

There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

Did you know?

No drugs are available to relieve parathyroid disease. Parathyroid disease is caused by a parathyroid tumor, and it needs to be removed by surgery.

Body plan of an echinoderm, as represented by a sea star. Body plan of an echinoderm, as represented by a sea star.
Alligators of various ages in Everglades National Park Alligators of various ages in Everglades National Park
Encephalization is a function of both brain size and body size. Encephalization is a function of both brain size and body size.
Trace Elements of the Human Body Trace Elements of the Human Body
How would you write the number 120 in Babylonian? How would you write the number 120 in Babylonian?
Mayan Number Mayan Number
Video: Ear Animation

For a complete list of videos, visit our video library