December 30, 2009 2:45 PM

Dust: Tiny particles with a big impact

Dust is everywhere, burrowing under beds, piling up on windowsills, clogging guns and machinery, irritating eyes, noses and lungs. It soars thousands of miles over continents and oceans, sometimes obliterating the sky. Now scientists are beginning to have new respect for the way dust alters the environment and affects the health of people, animals and plants.

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