« previous next »
« previous next »
 

Did you know?

In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.

Did you know?

A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.

Did you know?

In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.

Did you know?

The horizontal fraction bar was introduced by the Arabs.

Did you know?

Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.

Male mandarin duck flying in Dublin, Ireland Male mandarin duck flying in Dublin, Ireland
Procedures and Diagnostic Tests Related to the Male Reproductive System Procedures and Diagnostic Tests Related to the Male Reproductive System
Male reproductive anatomy. Male reproductive anatomy.
Summary of Homologous Structures of the Female and Male Reproductive Systems Summary of Homologous Structures of the Female and Male Reproductive Systems
Cytoplasmic Male Sterility in Flowering Plants Cytoplasmic Male Sterility in Flowering Plants
Video: Digestive chemicals - types & enzymes

For a complete list of videos, visit our video library