« previous next »
« previous next »
 

Did you know?

It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.

Did you know?

According to the Migraine Research Foundation, migraines are the third most prevalent illness in the world. Women are most affected (18%), followed by children of both sexes (10%), and men (6%).

Did you know?

The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."

Did you know?

Thyroid conditions may make getting pregnant impossible.

Did you know?

The average office desk has 400 times more bacteria on it than a toilet.

Historian James Merrell notes several errors in Benjamin West’s famous 1771 painting, William Penn’s Historian James Merrell notes several errors in Benjamin West’s famous 1771 painting, William Penn’s
An example of a commercial spill kit. An example of a commercial spill kit.
Real Price of Oil, 1861–2010 Real Price of Oil, 1861–2010
High school science classes are required to use deductive logic High school science classes are required to use deductive logic
Determine the # of real roots from the equation Determine the # of real roots from the equation
Video: Sperm Formation

For a complete list of videos, visit our video library