Photo: Bird Flu: Frequently Asked Questions



A colorized image shows H5N1 avian flu strain viruses (gold) grown in dog kidney cells (green).

Photograph by C. Goldsmith/U.S. Centers for Disease Control


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NATIONAL GEOGRAPHIC'S PHOTO OF THE DAY

50 Drives of a Lifetime

National Geographic Traveler has scoured the globe for the world's most beautiful, interesting, and off-beat road trips. Dive in to get drive directions, quizzes, photos, and more.