« previous next »
« previous next »
 

Did you know?

There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

Did you know?

Vaccines prevent between 2.5 and 4 million deaths every year.

Did you know?

The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.

Did you know?

A recent study has found that following a diet rich in berries may slow down the aging process of the brain. This diet apparently helps to keep dopamine levels much higher than are seen in normal individuals who do not eat berries as a regular part of their diet as they enter their later years.

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.

Large male size and mating success. Large male size and mating success.
ending is impeded by the magnetic attraction between stick and stickase ending is impeded by the magnetic attraction between stick and stickase
Evaluation measures to determine the success of goals Evaluation measures to determine the success of goals
Success is not always what you see Success is not always what you see
Presidential success under unified and divided government, from Eisenhower to trump Presidential success under unified and divided government, from Eisenhower to trump
Video: Retina

For a complete list of videos, visit our video library