« previous next »
« previous next »
 

Did you know?

There used to be a metric calendar, as well as metric clocks. The metric calendar, or "French Republican Calendar" divided the year into 12 months, but each month was divided into three 10-day weeks. Each day had 10 decimal hours. Each hour had 100 decimal minutes. Due to lack of popularity, the metric clocks and calendars were ended in 1795, three years after they had been first marketed.

Did you know?

Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.

Did you know?

The strongest synthetic topical retinoid drug available, tazarotene, is used to treat sun-damaged skin, acne, and psoriasis.

Did you know?

About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.

Did you know?

Although not all of the following muscle groups are commonly used, intramuscular injections may be given into the abdominals, biceps, calves, deltoids, gluteals, laterals, pectorals, quadriceps, trapezoids, and triceps.

Structure of HIV Structure of HIV
A general model of the sensorimotor system. Notice its hierarchical structure, functional ... A general model of the sensorimotor system. Notice its hierarchical structure, functional ...
Desertification and Climate Change Desertification and Climate Change
Crystal structure of a synthetic Holliday junction Crystal structure of a synthetic Holliday junction
Internal structure of the nose—lateral view Internal structure of the nose—lateral view
Video: Embryonic development - Weeks 5 to 8

For a complete list of videos, visit our video library