« previous next »
« previous next »
 

Did you know?

When Gabriel Fahrenheit invented the first mercury thermometer, he called "zero degrees" the lowest temperature he was able to attain with a mixture of ice and salt. For the upper point of his scale, he used 96°, which he measured as normal human body temperature (we know it to be 98.6° today because of more accurate thermometers).

Did you know?

More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.

Did you know?

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

Did you know?

Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.

Did you know?

The shortest mature adult human of whom there is independent evidence was Gul Mohammed in India. In 1990, he was measured in New Delhi and stood 22.5 inches tall.

Traditional animal phylogeny based on body plans. Traditional animal phylogeny based on body plans.
Border Collie Border Collie
Contact theory indicates that prejudice decreases and relations improve when individuals of ... Contact theory indicates that prejudice decreases and relations improve when individuals of ...
Crossing the border at Calexico, California. Crossing the border at Calexico, California.
How to use Cramer's rule to solve a second-order determinant (Question 2) How to use Cramer's rule to solve a second-order determinant (Question 2)
Improve your driver posture Improve your driver posture
Video: The Lac Operon in E. Coli

For a complete list of videos, visit our video library