« previous next »
« previous next »
 

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?

Asthma-like symptoms were first recorded about 3,500 years ago in Egypt. The first manuscript specifically written about asthma was in the year 1190, describing a condition characterized by sudden breathlessness. The treatments listed in this manuscript include chicken soup, herbs, and sexual abstinence.

Did you know?

About 60% of newborn infants in the United States are jaundiced; that is, they look yellow. Kernicterus is a form of brain damage caused by excessive jaundice. When babies begin to be affected by excessive jaundice and begin to have brain damage, they become excessively lethargic.

Did you know?

The oldest recorded age was 122. Madame Jeanne Calment was born in France in 1875 and died in 1997. She was a vegetarian and loved olive oil, port wine, and chocolate.

Did you know?

There can actually be a 25-hour time difference between certain locations in the world. The International Date Line passes between the islands of Samoa and American Samoa. It is not a straight line, but "zig-zags" around various island chains. Therefore, Samoa and nearby islands have one date, while American Samoa and nearby islands are one day behind. Daylight saving time is used in some islands, but not in others—further shifting the hours out of sync with natural time.

Areas of differing productivity and diversity in a wetland. (a) Typha dominates core habitats, while Areas of differing productivity and diversity in a wetland. (a) Typha dominates core habitats, while
The spotted wobbegong is the largest wobbegong shark, reaching a length of around 3 m The spotted wobbegong is the largest wobbegong shark, reaching a length of around 3 m
Splicing mechanisms in group I and group II self-splicing introns and spliceosom Splicing mechanisms in group I and group II self-splicing introns and spliceosom
Species Diversity "تنوع الكائنات الحية" Species Diversity "تنوع الكائنات الحية"
A crowd in Iceland reflects its narrow range of genetic diversity A crowd in Iceland reflects its narrow range of genetic diversity
A company that makes cell phones has the following cost structure. They have fixed costs of ... A company that makes cell phones has the following cost structure. They have fixed costs of ...
Video: Cellular slime mold life cycle Animation

For a complete list of videos, visit our video library