« previous next »
« previous next »
 

Did you know?

Medication errors are three times higher among children and infants than with adults.

Did you know?

When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.

Did you know?

More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.

Did you know?

Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.

Did you know?

Disorders that may affect pharmacodynamics include genetic mutations, malnutrition, thyrotoxicosis, myasthenia gravis, Parkinson's disease, and certain forms of insulin-resistant diabetes mellitus.

Old people Old people
People riding bikes in Netherlands People riding bikes in Netherlands
Eugène Delacroix, Liberty Leading the People. Eugène Delacroix, Liberty Leading the People.
People are living longer today than in previous decades People are living longer today than in previous decades
Out of Many: A History of the American People Out of Many: A History of the American People
By the People: A History of the United States, AP Edition By the People: A History of the United States, AP Edition
Video: Four Giant Convection Cells oF Earth

For a complete list of videos, visit our video library