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President Obama visits Phoenix Wednesday as part of a five-state campaign tour. The campaign thinks it can win Arizona, and that's an unlikely ambition for this conservative state. But Obama might have a chance. Unlikely upsets have dominated Arizona politics lately. The electorate is in flux.

British adventurer Felicity Aston this week became the first woman to ski solo across Antarctica, from one coast to another. It took her 59 days to cover more than 1,000 miles, dragging her supplies behind her on sleds. She talked to Steve Inskeep from the Union Glacier base camp in Antarctica while waiting to go home.

The biggest solar storm in years has lit up the skies with the spectacular show known as the Northern Lights. The Aurora Borealis offers a spectacle of green and blue over Canada and Northern Europe. The big storm is treating stargazers as far south as England — and may well make up for the disruptions it could bring to the electrical grid and GPS signals.

Staff Sgt. Frank Wuterich apologized but said, "sometimes combat actions can cause tragic results."

Tens of thousands of people took to the streets both in celebration and in protest of the country's new military rulers.

The space agency's latest composite image of Earth offers a detailed view of North and Central America. It's one in a long line of "Blue Marble" shots since the original was taken by the Apollo 17 crew in 1972.

In a wide-ranging interview with NPR, the GOP presidential candidate talked about everything from civil rights to a graduated tax.

Geithner say she's confident President Obama will be re-elected. And, Geithner's also confident "he's not going to ask me to stay on." He spoke with Bloomberg Television today.

President Obama's appointee for antitrust issues in the meat industry wanted to give cattlemen more clout against big meatpackers. But he's quitting his job on Thursday. His reform efforts ran into fierce opposition from the country's packers and big cattle producers.

Men are diagnosed with mild cognitive impairment earlier than women, perhaps because of physical health issues. That's the word from a study of older people in Minnesota. But by their mid-80s, both men and women suffer the same level of loss of thinking capacity, the researchers found.