« previous next »
« previous next »
 

Did you know?

There are 20 feet of blood vessels in each square inch of human skin.

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.

Did you know?

Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.

Did you know?

Drug-induced pharmacodynamic effects manifested in older adults include drug-induced renal toxicity, which can be a major factor when these adults are experiencing other kidney problems.

Did you know?

It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.

World Ecosystem World Ecosystem
Midway Island, an inhospitable atoll acquired in 1867, was valuable as a military base located midwa Midway Island, an inhospitable atoll acquired in 1867, was valuable as a military base located midwa
U.S. adults from 25 to 74 years report that the largest proportion of their daily stressors arise ... U.S. adults from 25 to 74 years report that the largest proportion of their daily stressors arise ...
World War I timeline World War I timeline
The Largest Cell The Largest Cell
(a) The distribution of sickle cell anemia in the Old World. (b) The distribution of malaria overlap (a) The distribution of sickle cell anemia in the Old World. (b) The distribution of malaria overlap
Video: Hormones and the menstrual cycle Animation

For a complete list of videos, visit our video library