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Former President Jimmy Carter will speak, by video at least, at the Democratic National Convention to urge a second term for President Obama. Meanwhile, Republicans announced that Rick Santorum, who was Mitt Romney's most durable rival for the presidential nomination, and former Florida Gov. Jeb Bush will speak at their convention.

While President Obama and Mitt Romney offer competing visions every day on the campaign trail, there's also a more superficial aspect to their campaigns. And from theme songs to crowd chants, the style of the presidential candidates' rallies couldn't be more different.

The Parkesdale Market, located on a key highway in the swing state of Florida, attracts more than just hungry customers. The Meeks family, which runs the farmers market, talks about their visits from presidential candidates past and what concerns them in this election year.

Allyson Felix has won the women's 200 meter race in London's Olympic Stadium, running a time of 21.88. Jamaica's Shelly-Ann Fraser-Pryce took the silver medal at 22.09, as she wasn't able to track Felix down in the closing stretch.

Google revealed that it had accidentally kept some data its Street View cars collected from unsecured wi-fi networks.

Scientists have learned that compact fluorescent light bulbs could give off ultraviolet radiation if their inner coating cracks. Light-emitting diodes, another eco-friendly lighting option, won't give you a sunburn, but they do have the potential for other mild health effects.

Listen to an in-studio concert and conversation with the Canadian singer and her longtime guitarist, Jordan Officer.

Many online video games give players the option of texting and talking to each other for a more interactive experience. For female gamers, it may often bring harassment, sexual threats and taunts. New York Times reporter Amy O'Leary explains how the online community is responding.

The recent shootings in Oak Creek, Wis., and Aurora, Colo., have reignited the debate about guns and gun control in America. But beyond the talking points and heated exchanges lie real questions about guns ownership, regulation and use.

Farmers are emptying some of the world's most important aquifers faster than rainfall can replenish them, which means less water for everyone. This map from the journal Nature shows where irrigation is doing the most damage.