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Aoudads are also known as barbary sheep is and live in a female dominant unit. Learn more interesting facts here at HowStuffWorks.

The Gray Wolf travels in packs and is known as the largest canid in the world. Get more facts at HowStuffWorks.

North American Porcupines can grow as long as 25 inches. Get more facts at HowStuffWorks.

COPD is a progressive disease that makes it more and more difficult to breathe as the disease worsens. Learn more about COPD by reading this article.

Do you know how to become a criminal profiler? Find out how to become a criminal profiler in this article from HowStuffWorks.

Is there a SARS vaccine? Visit HowStuffWorks to learn if there is a SARS vaccine.

Refurbished electronics are items that have been renewed or updated in some fashion. Find out if it is better to buy refurbished electronics.

Fallout shelters can help protect you from radiation from a nuclear attack. Learn how fallout shelters work, and how to build a fallout shelter.

Tax shelters help reduce your tax burden to the IRS by reducing your taxable income. Learn how to use, and not abuse, tax shelters at HowStuffWorks.

Learn natural home remedies for low immunity that will bolster your resistance to everything from the common cold to cancer.

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