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There are four stages of emphysema. Learn more about the stages of emphysema by reading this article.

What is bi-compartmental osteoarthritis? Learn more about bi-compartmental osteoarthritis from this article.

Are nosebleeds a sign of springtime allergies? Learn if nosebleeds are a sign of springtime allergies in this article.

Not everyone who has pollen allergies likes to take drugs. Learn whether cauliflower can help pollen allergies in this article.

Pollen allergies tend to develop during childhood or early adulthood. Learn how long allergies to pollen last in this article.

Tree pollen allergies are a result of a mistake by your immune system. Learn some symptoms of tree pollen allergies in this article.

What happens when there's too much voltage? Learn about the difference between voltage surges and spikes from this article.

Monster Science gets up close and personal with the creeptastic facehugger from "Alien." Learn more at HowStuffWorks Now.

Sastrugi are gorgeous snow formations found in the polar north, but they're also no fun to travel over.

Animation software can help animators turn their concepts into visible animation. Find out what animation software can do.

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