« previous next »
« previous next »
 

Did you know?

The familiar sounds of your heart are made by the heart's valves as they open and close.

Did you know?

Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.

Did you know?

The eye muscles are the most active muscles in the whole body. The external muscles that move the eyes are the strongest muscles in the human body for the job they have to do. They are 100 times more powerful than they need to be.

Did you know?

Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.

Did you know?

Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.

A soil surface crust that includes nitrogen-fixing, soil-enriching cyanobacteria. A soil surface crust that includes nitrogen-fixing, soil-enriching cyanobacteria.
Critical Thinking Skills chart Critical Thinking Skills chart
Teaching tools for instruction Teaching tools for instruction
The tools necessary to adjust the valves on an engine with adjustable rocker arms include basic hand ... The tools necessary to adjust the valves on an engine with adjustable rocker arms include basic hand ...
Selected Topical Corticosteroids for Dermatological and Oral Lesions Selected Topical Corticosteroids for Dermatological and Oral Lesions
Basic Chart of Food Chain Basic Chart of Food Chain
Video: Enzyme structure - Properties of enzymes

For a complete list of videos, visit our video library