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Earth Matters : Pollen: A great leap for plants gets its hooks in people, too

By Lawrence J. Winship

Every spring our car windows, decks and sidewalks are blanketed by layer upon layer of yellow powder. A seemingly unending rain of tiny particles filters down from birches, oaks, pines and other trees, sticking to every horizontal surface — and making about 25% of the human population sneeze. Lawrence J. Winship explains what wind-dispersed pollen does for plants and to people- and ends his tale with very curious questions.