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Graduate student Robert Lynch is on a quest to deconstruct our built-in instinct for humor, and find out why making people laugh could be important to the way we've adapted to survive.

In Hillsborough County, the way people voted in 2008 — for or against President Obama — signals their perception of everything that's happened since and, usually, the way they intend to vote. In this swing county hit hard by the financial crisis, the rarest voter is a person who's changed his mind.

The rolling NASA laboratory called Curiosity has begun its two-year mission on the Red Planet. The nuclear-powered robot pulled off a tricky touchdown in a Martian crater. There is a lot riding on this mission — not the least is the $2.5 billion price tag.

Jamaican Usain Bolt won the men's 100-meter sprint at a record time of 9.63 seconds Sunday. Bolt won the event four years ago in Beijing. The U.S. men's basketball team will meet Argentina Monday.

Darryl Burnette, a professional chef, spends about 10 hours a week at Harlem Grown, a nonprofit that promotes urban gardening and good nutrition among school kids.

Hundreds of people gathered in Times Square Sunday night to watch NASA TV. The landing of the Mars rover Curiosity was being shown on the big screen there. It was on the same screen that displays the countdown on New Year's Eve.

Sikh rights groups say that since the Sept. 11 terrorist attacks, there has been a marked rise in hate crimes against Sikhs. To talk more about that and to learn about the religion, Steve Inskeep talks to Kavneet Singh, managing director of the Sikh American Legal Defense and Education Fund.

Law enforcement officials confirm that the man they say was the gunman was Wade Michael Page, 40. Authorities are treating the attack as a possible act of domestic terrorism. They're looking at ties between Page white supremacist groups.

Also: Mars rover pulls off high-wire landing; Egypt vows to crack down on "infidels;" Mitt Romney raised $101 Million in July.

Gunshots tore through a Sunday prayer service at a Sikh temple in Oak Creek, Wis., a suburb just south of Milwaukee. Seven people have been confirmed dead including the gunman. For more on the shooting, Steve Inskeep talks to Don Walker, a reporter for the Milwaukee Journal Sentinel.