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The largest solar flare in four years erupted Monday, and its radiation is expected to reach Earth tonight. The impact could interfere with communication systems, power grids and navigation satellites.

Driving a Prius and putting up solar panels aren't the only options for cooling the earth's climate. More radical ideas include brightening clouds, creating giant algae blooms in the ocean and launching spacecraft to deploy giant sunshades. It might sound a bit far-fetched, but scientists are considering ideas like these — known as geoengineering — to alter the climate.

Up next in the Republican presidential race is Kansas, which holds its caucuses Saturday.

In 1543, when Nicolaus Copernicus made the astounding claim that Earth revolves around the sun, not the other way around, his ideas were met with scorn. "It went against everything that your senses tell you. It went against common sense," says author Dava Sobel, who wrote a new book about the astronomer.

Vaddey Ratner's In the Shadow of the Banyan draws on her childhood experiences under the brutal Khmer Rouge regime in Cambodia. It follows Raami, a young polio survivor, from her idyllic home to the depths of totalitarian exploitation.

The educational division of the media conglomerate News Corp, called Amplify, unveiled a new digital tablet this week at the SXSW tech conference in Austin, Texas, intended to serve millions of schoolchildren and their teachers across the country.

The educational division of the media conglomerate News Corp, called Amplify, unveiled a new digital tablet this week at the SXSW tech conference in Austin, Texas, intended to serve millions of schoolchildren and their teachers across the country.

If you love music, science fiction movies, and food trucks, then you'll want to tune in to our weekend preview.

Companies and governments have access to an unprecedented amount of digital information, much of it personal: what we buy, what we search for, what we read online. Kenneth Cukier, co-author of the book Big Data, describes how data-crunching is becoming the new norm.

Flagstaff's Ponderosa High School is where at-risk kids are given one last chance to graduate. More and more students are successful each year.