Engaging, mentally stimulating work is good for the brain, scientists say, whether you get paid to do it or not. Running a household can be as mentally demanding as running a company.
Seattle Police Detective Kevin Nelson (left) talks with U.S. Army soldiers at an October job fair at Joint Base Lewis-McChord, Wash., for soldiers who may exit military service in the next year.
Ted S. Warren/AP
A construction worker looks down on the site of the Manhattan West project last month in New York. Construction was among the hardest-hit sectors during the worst recession in modern memory.
Third-year medical student Allie Tetreault, left, talks with Gabrielle Nuki, 16, at Maine Medical Center in Portland, Maine. Gabrielle helps med students practice patient care.