« previous next »
« previous next »
 

Did you know?

In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.

Did you know?

In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).

Did you know?

For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.

Did you know?

If you use artificial sweeteners, such as cyclamates, your eyes may be more sensitive to light. Other factors that will make your eyes more sensitive to light include use of antibiotics, oral contraceptives, hypertension medications, diuretics, and antidiabetic medications.

Did you know?

Many people have small pouches in their colons that bulge outward through weak spots. Each pouch is called a diverticulum. About 10% of Americans older than age 40 years have diverticulosis, which, when the pouches become infected or inflamed, is called diverticulitis. The main cause of diverticular disease is a low-fiber diet.

The nitrogen cycle. Numbers represent fluxes as 1012 g N per year (data from Schlesinger 1991, after The nitrogen cycle. Numbers represent fluxes as 1012 g N per year (data from Schlesinger 1991, after
History of the number of observed sunspots during the last 250 years, which shows the ~11-year solar History of the number of observed sunspots during the last 250 years, which shows the ~11-year solar
This diagram shows a cross-section of a solar-type star. This diagram shows a cross-section of a solar-type star.
Mammography. (b) A mammogram. A tumor is visible in this mammogram, indicated by the arrow in the lo Mammography. (b) A mammogram. A tumor is visible in this mammogram, indicated by the arrow in the lo
The upper panel shows that scores of four diverse samples of boys on a moral reasoning test show a ... The upper panel shows that scores of four diverse samples of boys on a moral reasoning test show a ...
Pathways of nitrogen metabolism (purple) in the general pattern of intermediary metabolism Pathways of nitrogen metabolism (purple) in the general pattern of intermediary metabolism
Video: Gastrulation: cross section of the frog

For a complete list of videos, visit our video library