Plankton make up 98 percent of the biomass of ocean life and provide half of the oxygen on the planet. Scientists are working to figure out how climate change may be affecting these important microorganisms. M. Ormestad/Tara Oceans hide caption

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Cheryl Gleasner, a research technologist at the Los Alamos National Laboratory, works with a genome sequencing machine designed for disease surveillance. Since the SARS epidemic in 2003, advances in sequencing technologies have greatly speed up the ability to detect and track a new virus. Ross D. Franklin/AP hide caption

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A mural in an ancient tomb in China shows a troupe of eunuchs. How long did they live? Wikimedia Commons hide caption

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Surgeons transplant a kidney in 8-year-old Sarah Dickman at Children's Healthcare of Atlanta in 2008. The proposed changes in the transplant list attempt to maximize kidney life in young patients. John Bazemore/AP hide caption

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Watson, now 84, says sequencing helped explain his past sensitivity to certain drugs. But he didn't want to know everything his sequenced genome revealed about his health future. Courtesy of Cold Spring Harbor Laboratory hide caption

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Shots - Health News

Scientists See Upside And Downside Of Sequencing Their Own Genes

Prominent geneticists are getting their own genomes decoded, revealing the benefits and risks.

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Slides containing DNA sit in a bay waiting to be analyzed by a genome sequencing machine. David Paul Morris/Bloomberg via Getty Images hide caption

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Shots - Health News

As Genetic Sequencing Spreads, Excitement, Worries Grow

Some experts are concerned that access to genomic information could stoke fears and invade privacy.

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An artist's re-creation of the first human migration to North America from across the Bering Sea. DEA Picture Library/De Agostini/Getty Images hide caption

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