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The Department of Agriculture introduces a new food pyramid that incorporates a symbol for physical activity. The nutritional guidelines, accompanied by a Web site offering tailored recommendations, are aimed at changing American lifestyles.

The Obama administration says Chicago winning its bid for the 2016 Olympics would be good for the city's economy. The same argument has been made by many Olympic bidders — but the proof is sketchy.

Tickets are sold out for the San Diego Chargers playoff game this Sunday. The Chargers will play the New England Patriots at home. KPBS Radio's Andrew Phelps reports that security will be tight.

The 2004 Nobel Prize in Physics is awarded to three Americans for their insights into the fundamental structures of matter -- the forces that bind together quarks. David Gross, David Politzer and Frank Wilczek showed how tiny quark particles interact, helping to explain how a coin spins -- and how the universe was built.

Riots in the Paris suburb of Villiers-le-Bel continue Tuesday, following the death Sunday of two teenagers in a collision with police. Robert Siegel talks with Michael Deibert, Paris correspondent for the Inter Press Service, who says there are reports that the violence now is as bad as the riots of 2005.

More than 100,000 Ohio jobs were lost this year, a result of the nation's economic crisis and, more specifically, a suffering auto industry. Ohio's unemployment rate of 7.2 percent, one of the highest in the country, has leaders in the Midwestern state asking Washington for help. Lt. Gov. Lee Fisher explains the extent of Ohio's labor crisis.

How much we trust the people around us may be strongly influenced by biology. Studies have found that levels of a hormone called oxytocin can change how trusting we are. Some people, like 9-year-old Isabelle, are born with a genetic disorder that may interfere with the body's regulation of this hormone. Isabelle has no social fear. She literally trusts everyone.

When South Carolina Gov. Mark Sanford jetted off to Buenos Aires for a secret tryst, he left not just his family but an entire state in the dark. By going incommunicado, Sanford acted imprudently — but doesn't seem to have violated any legal requirements of his office.

Around the nation today, the 10th anniversary of the Sept. 11 terrorist attacks was marked with prayers, solemn ceremonies, vows to remember the nearly 3,000 victims and pledges to never let terrorists fundamentally change the American way of life.

When Earle Helton was hospitalized earlier this year, his medications caused him to suffer an episode of delirium. Helton isn't alone. About one-third of seniors who are hospitalized experience delirium, which is sometimes preventable.