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What separates good preschool from bad? A new report maps out some key answers by studying successful programs.

Republicans are hoping "check and balance" arguments can help save their majority, but Democrats have multiple paths to the four or five seats they need to win control of the Senate.

Women in prison often eat to relieve stress or boredom. The resulting weight gain can make other physical and emotional problems worse. In one prison, spinning helps keep the pounds and rage at bay.

Also this week: a look at President Obama's decision to keep more U.S. troops in Afghanistan.

Welfare changes in the 1990s helped slash cash benefit rolls, yet the use of food stamps has soared today. One of the original architects of the Clinton overhaul says it was a success, but an official who resigned in protest of the bill says poverty is still on the rise.

Ann Powers on one of the world's biggest singers, who died at age 48 Saturday afternoon.

Physicians and health data specialists caution that the information can be easily misconstrued. Some cancer doctors receive payments that cover the cost of expensive drugs for patients.

Unlike other exhaustive guides to Mexico's diverse regional foods, Mexico: The Cookbook was written by a Mexican. Margarita Carrillo's recipes aim for simplicity to lure American readers to explore.

Latinos make up 9 percent of the state's population and 2 percent of registered voters, and a new poll shows many are undecided. In Charlotte, Michel Martin learns more about their growing influence.

Many South Koreans are reacting with cautious optimism. But politicians seem more confident. "We will see major changes in the next two months," South Korean President Moon Jae-in told his cabinet.