« previous next »
« previous next »
 

Did you know?

During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).

Did you know?

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

Did you know?

Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.

Did you know?

In 1885, the Lloyd Manufacturing Company of Albany, New York, promoted and sold "Cocaine Toothache Drops" at 15 cents per bottle! In 1914, the Harrison Narcotic Act brought the sale and distribution of this drug under federal control.

Did you know?

The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.

A page from Kelileh o Demneh dated 1429, from Herat, a Persian translation of the ancient Indian Pan A page from Kelileh o Demneh dated 1429, from Herat, a Persian translation of the ancient Indian Pan
Rusty-tipped Page (Siproeta epaphus), Butterfly World (Florida) Rusty-tipped Page (Siproeta epaphus), Butterfly World (Florida)
Directional drilling taps multiple oil deposits Directional drilling taps multiple oil deposits
Activity versus specific activity Activity versus specific activity
Examples of Specific Antidotes for Overdosed Substances or Toxins Examples of Specific Antidotes for Overdosed Substances or Toxins
Heritability (h2) of Addiction to Specific Addictive Agents Heritability (h2) of Addiction to Specific Addictive Agents
Video: T cell receptors

For a complete list of videos, visit our video library