« previous next »
« previous next »
 

Did you know?

On average, the stomach produces 2 L of hydrochloric acid per day.

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?

Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.

Did you know?

About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.

Did you know?

Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.

Milestones of Gross Motor Development in Infancy Age ranges provided are for 90% of American infant Milestones of Gross Motor Development in Infancy Age ranges provided are for 90% of American infant
French and U.S. presidential elections in 2012 illustrate the durability of political culture and ho French and U.S. presidential elections in 2012 illustrate the durability of political culture and ho
Japan’s surprise attack on Pearl Harbor on December 7, 1941, killed more than 2,400 American ... Japan’s surprise attack on Pearl Harbor on December 7, 1941, killed more than 2,400 American ...
From 1965 to 1968, American troops in Vietnam conducted “search and destroy” missions to shatter ... From 1965 to 1968, American troops in Vietnam conducted “search and destroy” missions to shatter ...
North American Climates North American Climates
Video: Embryonic development - Weeks 5 to 8

For a complete list of videos, visit our video library