« previous next »
« previous next »
 

Did you know?

A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.

Did you know?

Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.

Did you know?

When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.

Did you know?

Most women experience menopause in their 50s. However, in 1994, an Italian woman gave birth to a baby boy when she was 61 years old.

Did you know?

An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.

Mutualisms, such as those that occur among plants and pollinators, generally involve large numbers o Mutualisms, such as those that occur among plants and pollinators, generally involve large numbers o
The dorsal fin and saddle patch of a resident killer whale in the northeastern Pacific Ocean. It may The dorsal fin and saddle patch of a resident killer whale in the northeastern Pacific Ocean. It may
Arctic fox at Svalbard, Norway. Arctic fox at Svalbard, Norway.
Vertebral compression Fractures of the spine (vertebra) can cause severe ”band-like” pain that radia Vertebral compression Fractures of the spine (vertebra) can cause severe ”band-like” pain that radia
Vija Celmins, Untitled (Ocean). Vija Celmins, Untitled (Ocean).
Ocean water is layered from top to bottom Ocean water is layered from top to bottom
Video: Gastroesophageal Reflux Disease (GERD)

For a complete list of videos, visit our video library