« previous next »
« previous next »
 

Did you know?

Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.

Did you know?

Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.

Did you know?

When Gabriel Fahrenheit invented the first mercury thermometer, he called "zero degrees" the lowest temperature he was able to attain with a mixture of ice and salt. For the upper point of his scale, he used 96°, which he measured as normal human body temperature (we know it to be 98.6° today because of more accurate thermometers).

Did you know?

The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

Did you know?

A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.

Eastern gray squirrels are born naked with their eyes closed Eastern gray squirrels are born naked with their eyes closed
Earthquakes Don’t Kill People—Collapsing Buildings Do Earthquakes Don’t Kill People—Collapsing Buildings Do
A propaganda poster enshrining Stalin proclaims that he has led his people “Forward to ... A propaganda poster enshrining Stalin proclaims that he has led his people “Forward to ...
How People Match Their Goals to Their Means How People Match Their Goals to Their Means
Where do you think these people fit in Gans’ classification of urban dwellers? Where do you think these people fit in Gans’ classification of urban dwellers?
The social movement that centers on the environment has become global. In all nations, people are ... The social movement that centers on the environment has become global. In all nations, people are ...
Video: Polymerase chain reaction PCR - Animation

For a complete list of videos, visit our video library