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Last year, the number of homeless U.S. veterans on a given night fell 12 percent from the year before. But tens of thousands were still on the streets, and more could soon join them as troops return home. President Obama has vowed to end veterans' homelessness by 2015.

"Americans now walk the least of any industrialized nation in the world," says writer Tom Vanderbilt. A reliance on cars, combined with a lack of sidewalks, means that what started as a push for convenience has become a difficult problem.

These debilitating, painful headaches affect three times more women than men. Migraines play out as a wave of electrical activity travels across the brain. Hormones can provide a trigger.

Over the weekend, tornadoes ripped through several states, killing at least five people in Oklahoma and causing millions in damage to communities. Among the hardest hit areas was Wichita, Kan., which has seen its share of hardship over the past several years.

The action by China's central bank widens the range at which the currency can be traded on the international market. The move is seen as seen a step toward addressing foreign complaints that China was suppressing the value of its money to boost Chinese exports, and hurt foreign imports.

George Mason University Economist Tyler Cowen talks to Steve Inskeep about his new book, An Economist Gets Lunch: New Rules for Everyday Foodies. Cowen criticizes people he calls food snobs, but at the same time, he admits that label also applies to him.

The Taliban has claimed responsibility for Sunday's multiple attacks in the Afghan capital Kabul. U.S. officials are praising Afghan forces, but questions remain about how the insurgents were able to infiltrate the most secure parts of the capital.

The man who has confessed to carrying out Norway's worst peace-time atrocity went on trial Monday. Anders Behring Breivik is accused of carrying out a twin bombing and shooting rampage that killed 77 people and wounded dozens last July. He told the court: "I admit to the acts, but not criminal guilt."

The National Rifle Association's annual convention featured a display of shooting targets featuring zombies. Firing ranges across the country are offering zombie-themed shooting events. Sales of zombie targets are booming.