Explore aortic valve stenosis, the improper closure of the aortic valve. Content describes what aortic regurgitation is with an animation, what causes it, and what can be done for this irregularity.

NASA site explores what a comet's nucleus is composed of. Animation and photographs are provided as well.

Find excellent information about the human lungs, and how they contribute to the gas exchange process for the body. Inside, find detailed illustrations and a short, narrated animation of the respiratory system at work.

In December 2005 an animal was discovered in the mountainous region deep in the heart of Borneo. This carnivorous species is suspected to posses characteristics similar to a cat or lemur. Learn more about this mysterious creature here.

Barn owls are sometimes called "monkey owls" in reference to their peculiar white, heart-shaped face. Use this resource to discover other unique facts about these silent predators.

At this site from Encyclopedia Brittanica, Inc. you can follow brave-hearted women through a timeline of unbelievable "Herstory." Impressive site tracks the unsinkable American woman from Early American adventurers like Sacagawea and...

This resource describes an organization that is involved in studies and treatments of allergies. Research and education are also important parts of this organization.