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But so, too, can cheeriness. Research on college roommates indicates that a person's psychological outlook can rub off on those close to them.

Alzheimer's disease and depression have a lot in common, and people with depression face a greater risk of dementia as they age. Researchers aren't sure why and are seeking clues. They are trying to find out if treating depression will then help prevent or delay dementia.

John and Mark (Carolyn Bruck is off today) enjoy the comedy and action of White House Down. Film reviewed: White House Down by hosts John DeSando and…

Major indexes in China closed down more than 5 percent Monday — making it the worst day for losses since 2009. The plunge reverberated, weighing down markets across Asia.

The former South African president, an icon of the anti-apartheid movement, remains in critical condition at a Pretoria hospital. He is being treated for a recurring respiratory infection. Mandela is 94.

In Russia, a culprit trying to make a quick buck made off with a small metal bridge. After dragging it home with his tractor, he cut it up with a welding torch. Police followed the trail he left behind.

Also: Opening statements due in trial of George Zimmerman for death of Trayvon Martin; NSA leader Edward Snowden thought to still be in Russia; another large wildfire continues to spread in Colorado.

Also: Lemony Snicket on storytelling; the best books coming out this week.

The court's term is set to end this week. But the justices still haven't issued rulings on cases involving same-sex marriage and voting rights.

The Supreme Court sent one of the most highly-anticipated cases this term back to a lower court. The case questioned whether race can be used in undergraduate college admissions. Host Michel Martin speaks with two court watchers about the decision.