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

itoggle caption Joe Raedle/Getty Images

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

itoggle caption Ian Stewart/AP

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

itoggle caption Public Domain, via Wikimedia

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

itoggle caption iStockphoto.com

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

itoggle caption Paul Sakuma/AP

Katie Benghauser, 57, has been diagnosed with osteopenia and takes Fosamax as treatment to prevent osteoporosis. Coburn Dukehart/NPR hide caption

itoggle caption Coburn Dukehart/NPR