You've probably heard that compact fluorescent light bulbs are more efficient than incandescent bulbs. More of the electricity they use goes into producing light, and less into producing heat than with incandescent bulbs. How much more...

This investigation will help learners understand the physical relationships between natural gas, oil, and water in a reservoir and how these relationships can affect recovery.

Here are some awe inspiring photos of cheetahs. Included you can also find a fact sheet detailing such things as: physical description, distribution, habitat, statistics, and more.

The BBC provides a general profile of polar bears, detailing information about their distribution, habitat, diet, behavior, reproduction, and conservation status. Numerous pictures and a video are also available.

Explains the difference between a synthetic compound and one found in its natural state. Uses the example of Percy Julian and Josef Pikl making the compound physostigmine, a medicine that was used in the treatment of glaucoma, in their lab.

A lesson where students take copies of their shoe prints, then create a story and illustrate it with pictures showing trails of footprints. Presented are samples of such trails that can be used to stimulate class discussion, and to...