Some men take testosterone hoping to boost energy and libido, or to build strength. But at what risk? iStockphoto hide caption

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There's more than one reason to aim for a good night's sleep. Charles Taylor/iStockphoto.com hide caption

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The active ingredient in Propecia, a baldness remedy approved by the Food and Drug Administration in 1997, is showing new promise as a way to prevent some prostate cancers. AP hide caption

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A billboard advertising robotic surgery hangs outside Boston's Fenway Park in 2009. Hospitals and doctors have heavily promoted robotic surgery. Charles Krupa/AP hide caption

itoggle caption Charles Krupa/AP