« 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?

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?

An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.

Did you know?

Critical care patients are twice as likely to receive the wrong medication. Of these errors, 20% are life-threatening, and 42% require additional life-sustaining treatments.

Did you know?

The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.

Continuous variation in a natural population Continuous variation in a natural population
Dentition of a collared peccary, as illustrated in Knight's Sketches in Natural History Dentition of a collared peccary, as illustrated in Knight's Sketches in Natural History
The Tsavo Man-Eaters on display in the Field Museum of Natural History in Chicago, Illinois. The Tsavo Man-Eaters on display in the Field Museum of Natural History in Chicago, Illinois.
When a Tornado Strikes: Social Organization Following a Natural Disaster When a Tornado Strikes: Social Organization Following a Natural Disaster
Low (or No) Natural Growth Low (or No) Natural Growth
Target Heart Rate Target Heart Rate
Video: Phases of mitosis

For a complete list of videos, visit our video library