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Ruby-throated Hummingbird engaging in a little pollination. Photo: <a href="http://www.flickr.com/photos/puttefin/5976511704/">Kelly Colgan Azar</a>, CC some rights reserved
Ruby-throated Hummingbird engaging in a little pollination. Photo: Kelly Colgan Azar, CC some rights reserved

Natural Selections: Pollen

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Is a bad year for pollen allergy sufferers a good year for plants? Why does some pollen cause stronger reactions? Martha Foley and Dr. Curt Stager look at the birds and bees, as practiced by the flowers and trees.

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