Allergies to pollen are often worse in spring, and could get even worse as temperatures rise. Many people are allergic to the fine and powdery pollen shed by trees, including willows. Ashley Cooper/Getty Images hide caption
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Bumblebees, like this Hunt's bumblebee in Colorado, are vanishing because of extreme temperatures and habitat loss. Peter Soroye hide caption
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Ready, set, fly! The ball bearings glued to this bumblebee's legs simulate the weight and placement of pollen loads. The tag on the insect's back is a lightweight sensor, designed to track its movements in flight. Courtesy of Andrew Mountcastle hide caption
Dallas Mildenhall, New Zealand's forensic pollen expert, peers at samples through a microscope. Courtesy of David Wolman hide caption
The decline of honeybees has been attributed to a variety of causes, from nasty parasites to the stress of being transported from state to state to feed on various crops in need of pollination. iStockphoto hide caption