« previous next »
« previous next »
 

Did you know?

If all the neurons in the human body were lined up, they would stretch more than 600 miles.

Did you know?

Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

Did you know?

In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.

Did you know?

The toxic levels for lithium carbonate are close to the therapeutic levels. Signs of toxicity include fine hand tremor, polyuria, mild thirst, nausea, general discomfort, diarrhea, vomiting, drowsiness, muscular weakness, lack of coordination, ataxia, giddiness, tinnitus, and blurred vision.

Did you know?

Cyanide works by making the human body unable to use oxygen.

Male giraffes will engage in necking to establish dominance. Male giraffes will engage in necking to establish dominance.
Firms Incorporated into U.S. Steel Firms Incorporated into U.S. Steel
In Second Life, multiplayer online game, two avatars engage in virtual courtship. In Second Life, multiplayer online game, two avatars engage in virtual courtship.
Looking at objects in nature is a great way to encourage joint attention and allows infants to learn ... Looking at objects in nature is a great way to encourage joint attention and allows infants to learn ...
U.S. Patents and Patents per Million Residents, 2010 U.S. Patents and Patents per Million Residents, 2010
Competitive firms and maximization Competitive firms and maximization
Video: Primate Evolutionary Tree Animation

For a complete list of videos, visit our video library