A recent report found that 85 percent of people who see doctors regularly have undiagnosed and uncontrolled high blood pressure. Joe Raedle/Getty Images hide caption

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For athletes and nonathletes alike, stretching to keep muscles limber may help prevent cramping later in life. Ian Stewart/AP hide caption

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A magnified view of a colony of embryonic stem cells from the H9 stem cell line, one of the few lines approved for federally funded research under the Bush administration. These cells are now off-limits under a new policy set up by President Obama. Public Domain, via Wikimedia hide caption

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In drug-testing, the researchers usually don't know which patients get the drug and which get the placebo. hide caption

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A technician at pharmaceutical company pursuing new gene therapy treatments collects re-engineered viruses, called "vectors." Viruses, stripped of their virulence and ability to replicate, are the most common delivery vehicles for healthy DNA. Paul Sakuma/AP hide caption

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