« previous next »
« previous next »
 

Did you know?

Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.

Did you know?

Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.

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?

Allergies play a major part in the health of children. The most prevalent childhood allergies are milk, egg, soy, wheat, peanuts, tree nuts, and seafood.

Did you know?

Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.

parabolic solar trough parabolic solar trough
This girl ran four spinning machines in a cotton mill in Whitnel, North Carolina. Only 4 feet, 3 inc This girl ran four spinning machines in a cotton mill in Whitnel, North Carolina. Only 4 feet, 3 inc
Three-dimensional structures of proteins: Fibrous protein Three-dimensional structures of proteins: Fibrous protein
Three-dimensional structures of proteins: Globular protein Three-dimensional structures of proteins: Globular protein
The three-dimensional structure formed of a protein The three-dimensional structure formed of a protein
Holley’s two-dimensional cloverleaf model of transfer RNA Holley’s two-dimensional cloverleaf model of transfer RNA
Video: Gas exchange - partial pressure, locations, external and internal respiration

For a complete list of videos, visit our video library