« previous next »
« previous next »
 

Did you know?

The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.

Did you know?

HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.

Did you know?

Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.

Did you know?

A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.

Did you know?

The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."

Regional differences affect soil fertility Regional differences affect soil fertility
Children and adolescents define themselves as they get older Children and adolescents define themselves as they get older
In the retina, there are two types of light receptor cells: Rods are sensitive to differences in lig In the retina, there are two types of light receptor cells: Rods are sensitive to differences in lig
Remote satellite monitoring of gross primary productivity across the United States. The differences Remote satellite monitoring of gross primary productivity across the United States. The differences
Some skeletal differences between a knuckle-walking gorilla and a bipedal human Some skeletal differences between a knuckle-walking gorilla and a bipedal human
Number writing practice 1-30 kindergarten Number writing practice 1-30 kindergarten
Video: Congenital Heart Defects Animation

For a complete list of videos, visit our video library