Amy Brighton from Medina, Ohio, who opposes the new health care law, rallies in front of the Supreme Court on Tuesday. Charles Dharapak/AP hide caption

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Doctors perform a kidney transplant operation in Spain in 2010. Xurxo Lobato/Cover/Getty Images hide caption

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A Predator B unmanned aircraft lands after a mission at the Naval Air Station last November in Corpus Christi, Texas. Eric Gay/AP hide caption

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Routines are made up of a three-part "habit loop": a cue, a behavior and a reward. Understanding and interrupting that loop is key to breaking a habit, says journalist Charles Duhigg. iStockphoto.com hide caption

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Employment has been rising in recent months, but most economists say Congress should keep trying to boost consumer spending. Mark Lennihan/AP hide caption

itoggle caption Mark Lennihan/AP