« previous next »
« previous next »
 

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?

Blood is approximately twice as thick as water because of the cells and other components found in it.

Did you know?

In 1844, Charles Goodyear obtained the first patent for a rubber condom.

Did you know?

Asthma cases in Americans are about 75% higher today than they were in 1980.

Did you know?

In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.

Adult, Child, and Infant CPR Standards Adult, Child, and Infant CPR Standards
Does everything in nature have a unique purpose (entelechy)? Does everything in nature have a unique purpose (entelechy)?
Hierarchical nature of hormone action in vertebrates Hierarchical nature of hormone action in vertebrates
Two Kinds of Forgetting Curves Two Kinds of Forgetting Curves
The Type of Blood Vessel Injury Often Affects the Nature of the Hemorrhage The Type of Blood Vessel Injury Often Affects the Nature of the Hemorrhage
Video: Type of Transport - Active and Passive Processes

For a complete list of videos, visit our video library