« previous next »
« previous next »
 

Did you know?

There are approximately 3 million unintended pregnancies in the United States each year.

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?

Approximately 500,000 babies are born each year in the United States to teenage mothers.

Did you know?

The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").

Cells dividing Cells dividing
insect's compound eye, revealing photoreceptor cells, support cells and pigment cells insect's compound eye, revealing photoreceptor cells, support cells and pigment cells
Sperm and Egg Cells Fusing Sperm and Egg Cells Fusing
Mumps Virus affecting cells Mumps Virus affecting cells
Increase in Obesity among U.S. Children and Adolescents Increase in Obesity among U.S. Children and Adolescents
Mast Cells Mast Cells
Video: Four Giant Convection Cells oF Earth

For a complete list of videos, visit our video library