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Rat Flea

Photo: Microscopic view of a rat flea
A flea clings to rat fur in this colored scanning electron micrograph. As carriers of plague, fleas have claimed more victims than all the wars ever fought.
Photograph by Dr. Tony Brain/Science Photo Library

Health and Human Body Topics


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Photo Contest

Find out who takes home the Grand Prize!

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Adventure Videos

Check out adventure videos from our West Coast Adventure Editor Steve Casimiro and go "Behind the Lens."

The Green Guide

Photo: Green flower

Get tips for helping the environment.

Support Conservation

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Help conserve the world's natural resources.