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United States runner Kam Conley sheds layers to train for the Olympics in England on Monday. Less clothing means more evaporation, keeping athletes cooler.

Summer Science: Clothes Keep You Cool, More Or Less

Stripping naked is a good way to cool off on a steamy day. But that won't pass muster on the street. Scientists say light-colored, lightweight clothing is the next best thing.

In these illustrations NASA produced from satellite data, the melt in Greenland on July 8 (at left) and July 12 are shown. According to NASA, "the areas classified as 'probable melt' (light pink) correspond to those sites where at least one satellite detected surface melting. The areas classified as 'melt' (dark pink) correspond to sites where two or three satellites detected surface melting."

'Heat Dome' Linked To Greenland's Biggest Melt In 30 Years

Satellite images show that from July 8 to July 12, nearly all of the ice sheet covering Greenland had experienced some melting. According to NASA, it's the biggest summer melt in more than 30 years.

Health care workers in South Africa speak to residents during a door-to-door AIDS awareness campaign, part of a series of prevention efforts that has helped lower the country's HIV infection rate.

Prevention Programs Curb New HIV Infections In South Africa

More than half a million South Africans were infected with HIV in 2000. Efforts to stem the virus since then have produced marked results in the number of new infections. But the total number of people with HIV in South Africa still isn't going down.

Senate Plans Two Symbolic Votes On Taxes That Won't Change Anything

There will be votes today on Democratic and Republican plans regarding the Bush tax cuts. But neither will mean much since the House isn't likely to agree to anything the Democratic-controlled Senate does.

When It Comes To Tax Cuts, Neither Side Is Blinking

Democrats and Republicans are going to the brink over tax cuts for the wealthiest Americans in a showdown that threatens to send the U.S. over a year-end "fiscal cliff." So what's at the heart of the impasse?

An ambulance and police cars outside the Century 16 movie theater complex in Aurora, Colo, during the early hours of July 20, 2012. A gunman attacked an audience there — killing 12 people and wounding 58.

As Details Emerge On Difficulty Getting Help To Victims, Colorado Funerals Begin

The attack overwhelmed first responders' resources. The result was an "outside in" response, the Denver Post reports, during which some of the less seriously injured got treated before those who were critically wounded.

Meb Keflezighi and Galen Rupp lead the race during the U.S Olympic Marathon Team Trials in February in Los Angeles.

How Many Calories Do Olympic Athletes Need?

To Olympians, food is fuel, and mileage may vary. Depending on their sport, contenders need to consume anywhere between 1,200 to 8,000 calories before competing.

The Tea Party's Texas Strategy For 2012

After their victories in 2010, the prominence and influence of the Tea Party waned, and the future of the movement remains unclear. NPR's Political Junkie columnist Ken Rudin and Bruce Buchanan, professor at the University of Texas at Austin, talk about the influence of the Tea Party in Texas.

A "historically low inventory" of cattle and hogs is driving up meat prices, a trend that's expected to continue next year, USDA economist Richard Volpe says.

Pray For Rain: Food Prices Heading Higher

The government forecasts food prices will go up as much as 3.5 percent this year; meat prices will rise as much as 4.5 percent. If the drought continues, prices may go up even more. "Until we get that first heavy rain, we're not going to know for sure" just where prices will end up, a USDA economist says.

Farewell, Buckyballs: Consumer Agency Files Suit Against Magnetic Toys

Major retailers have agreed to stop carrying the "high-powered magnets."

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