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Scientists have come up with an algorithm to guess how many stars a recipe will receive online. By building "social networks" for ingredients, the algorithms also reveal how we mix and match spices, make dishes more healthful and customize flavor profiles.

President Obama and Republican challenger Mitt Romney are hitting the campaign trail hard this week. On Tuesday, the president was campaigning in Iowa — the state that helped to launch his White House bid in 2008. He told supporters in Iowa he wants a second term in order to finish what he started.

The Stanley Cup finals are set, the NBA playoffs feature a thrilling matchup between Texas and Oklahoma, and the French Open, uh, opens. Host Scott Simon catches up on the week in sports with NPR's Tom Goldman.

Delicious in everything from terrine to sorbet, the versatile tomato is one of the signature tastes of summer. Chef Cassy Vires, of Home Wine Kitchen in Maplewood, Mo., shares some of her favorite summer tomato recipes.

Ruth Ann Steinhagen was 19 when she shot Eddie Waitkus, a Philadelphia Phillie. She had been obsessed with him, and lured Waitkus to a Chicago hotel room. Initially judged to be insane, she was never tried. For about 60 years, she lived a quiet life in Chicago.

Republicans retain hopes of retaking control of the Senate. They lost the majority in 2006, in part because of the razor-close victory of Democratic challenger Jon Tester in Montana. Now, Tester is the incumbent facing a tough challenge of his own against the state's sole member of the House.

It's been more than a month since the government began accepting requests for its Deferred Action for Childhood Arrivals program, a new policy for young people brought to the U.S. illegally as children. It means that for two years they can avoid deportation and get a work permit.

Shortly after the Colorado shootings, a Denver 18-year-old named Morgan Jones started a thread on the social media site Reddit. It built through the night into a minute-by-minute chronicle of tragedy.

President Obama and Mitt Romney are scheduled to address the National Association of Latino Elected and Appointed Officials conference in Orlando. Robert Siegel speaks with Arturo Vargas, executive director of the group, about what issues attendees would like to hear about.

The case involves a famous political family and has rocked the Communist Party establishment. A verdict will be announced later against Gu Kailai who is accused of murdering a British businessman.