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Reporting in the Bulletin of the American Meteorological Society, researchers write that extreme heat waves, such as the one last year in Texas, are 20 times more likely today than they were in the 1960s. NOAA climatologist Tom Peterson discusses what future climate change may bring.

As you sweat during hot-weather exercise, the body's temperature inches up, and heatstroke can result. Douglas Casa, of the Korey Stringer Institute, explains the best way to stay safely hydrated during summer activity--and why too much water can be a bad thing too.

For decades, coal represented half of the nation's electricity generation, but it dropped to only 34 percent for the month of March. While the decline is partially due to a warmer winter and stricter environmental regulations, the real culprit may be natural gas. Technological breakthroughs in fracking have led to a gas boom that's caused prices to plummet. As a result, power plants are switching from coal to natural gas and mines in Appalachia are shutting down.

President Obama is on a two-day Virginia campaign swing, the airwaves are awash in campaign ads, and there's a veritable who-has-more-campaign-offices arms race under way. It's a situation that astounds lifelong Virginians. Says one political analyst: "It's almost the new Ohio."

It's no easy trick for the National Governors Association to get Republican and Democratic chief executives in the same room. After the Supreme Court decision on the Affordable Care Act a few weeks ago, it's proving even harder.

Documents suggest Mitt Romney was chief executive at Bain Capital for longer than he has said. That's significant — but only to a point.

The Republican candidate for president went on the offensive in interviews with all major networks.

Apple is rejoining a widely used registry of environmentally friendly electronic devices. The surprise move comes after the company received harsh public criticism for turning its back on its green environmental image.

Mitt Romney made a personal TV news blitz to insist the timing of his tenure at Bain Capital is a nonstory. Ultimately, what might determine its importance in the presidential race is whether it can be explained in the kind of 30-second TV ad that has come to dominate political messaging.

Visa, MasterCard and some of the largest banks in the country have agreed to pay more than $6 billion to settle a lawsuit that claimed they conspired to fix credit card payment fees. The suit was brought on behalf of seven million merchants. The agreement could have wide-ranging implications for retailers and consumers. Steve Henn talks to Melissa Block.