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In a north London hospital, scientists are growing noses, ears and blood vessels in the laboratory in a bold attempt to make body parts using stem cells.

website addressing college majors and occupations; interactive graphic and video 

How does it spread? The Varroa mite carries the disease, feeding on bee larvae, then the virus itself kills off the bees. The study's lead author, Dr. Lena Wilfert, of the University of Exeter's Centre for Ecology and Conservation, said they found evidence that human involvement has played a key role in the epidemic.

His "Photo Ark" currently houses images of more than 5,000 species, rolling past the viewer. "It would take two hours to see them all," he said. "It's supposed to just overwhelm people with what life looks like on Earth." And what might soon be extinct.

4:32 video Dr. Debbye Turner Bell profiles one 7-year-old Virginia boy who has found a creative way to improve the lives of countless Epilepsy patients and seizure sufferers.