« previous next »
« previous next »
 

Did you know?

Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.

Did you know?

It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.

Did you know?

The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.

Did you know?

The human body produces and destroys 15 million blood cells every second.

Did you know?

There are more nerve cells in one human brain than there are stars in the Milky Way.

These species are all at risk of extinction. These species are all at risk of extinction.
A number of tree species can be interconnected by mycorrhizal fungi in the forests of British Columb A number of tree species can be interconnected by mycorrhizal fungi in the forests of British Columb
Schematic of the Earth–Moon system (without a consistent scale) Schematic of the Earth–Moon system (without a consistent scale)
Rivers on Mars and Earth Rivers on Mars and Earth
The crania, and especially the faces of KNM-ER 1813 and 1470, differ enough that some scientists inc The crania, and especially the faces of KNM-ER 1813 and 1470, differ enough that some scientists inc
Earth 240 Million Years Ago Earth 240 Million Years Ago
Video: Acids and bases - definition

For a complete list of videos, visit our video library