« previous next »
« previous next »
 

Did you know?

A strange skin disease referred to as Morgellons has occurred in the southern United States and in California. Symptoms include slowly healing sores, joint pain, persistent fatigue, and a sensation of things crawling through the skin. Another symptom is strange-looking, threadlike extrusions coming out of the skin.

Did you know?

People often find it difficult to accept the idea that bacteria can be beneficial and improve health. Lactic acid bacteria are good, and when eaten, these bacteria improve health and increase longevity. These bacteria included in foods such as yogurt.

Did you know?

Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.

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?

More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.

The work of Charles Darwin forms the foundation for modern evolutionary theory. The work of Charles Darwin forms the foundation for modern evolutionary theory.
Signal Detection Theory Signal Detection Theory
Four kinds of evidence supporting the theory that species evolve. Four kinds of evidence supporting the theory that species evolve.
The clonal selection theory of the adaptive immune response The clonal selection theory of the adaptive immune response
The Nebular Theory The Nebular Theory
Modern Cell Theory Modern Cell Theory
Video: Introduction to Spirometry

For a complete list of videos, visit our video library