« previous next »
« previous next »
 

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."

Did you know?

More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.

Did you know?

Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.

Did you know?

About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.

Did you know?

Today, nearly 8 out of 10 pregnant women living with HIV (about 1.1 million), receive antiretrovirals.

Illustration showing how the primary breast tumor metastasized through the lymphatic and blood vesse Illustration showing how the primary breast tumor metastasized through the lymphatic and blood vesse
Filter in the vena cava prevents an embolus from traveling to the heart, lungs, or brain; A, Greenfi Filter in the vena cava prevents an embolus from traveling to the heart, lungs, or brain; A, Greenfi
Venous return to the heart and blood flow to the lungs. Venous return to the heart and blood flow to the lungs.
A typical clean-in-place system A typical clean-in-place system
Cilia and Flagella Cilia and Flagella
Human Lungs (Respiratory System) Human Lungs (Respiratory System)
Video: Gastrulation: cross section of the frog

For a complete list of videos, visit our video library