« previous next »
« previous next »
 

Did you know?

Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.

Did you know?

Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.

Did you know?

Patients who have been on total parenteral nutrition for more than a few days may need to have foods gradually reintroduced to give the digestive tract time to start working again.

Did you know?

Asthma cases in Americans are about 75% higher today than they were in 1980.

Did you know?

Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.

These species are all at risk of extinction. These species are all at risk of extinction.
These species are all at risk of extinction. Species with slow life-h These species are all at risk of extinction. Species with slow life-h
Electromagnetic Radiation Chart Electromagnetic Radiation Chart
Are good deeds selfish? Are good deeds selfish?
The Fate of Solar Radiation The Fate of Solar Radiation
Chart showing average yearly dose of radiation from natural and human-made sources Chart showing average yearly dose of radiation from natural and human-made sources
Video: Electromagnetic Spectrum, Chlorophyll and Pigment & Light

For a complete list of videos, visit our video library