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Republican presidential candidate Mitt Romney appears a man under siege.

His political strategists are feuding over the direction of the campaign. He bungled his "presidential moment" with an ill-timed and ill-informed response to violence in Libya that led to the death of a U.S. ambassador and three other Americans.

Yukiya Amano is frustrated.

Last week, Amano, the director general of the International Atomic Energy Agency, told a meeting of the agency in Vienna that he is aggravated by Iran's unwillingness to show the IAEA what's going on at a base called Parchin.

"Iran should engage with us without further delay on the substance of our concerns," he said. "We need to stop going around in circles, discussing process."

President Obama kicked off the week in the battleground state of Ohio, where he spent much of the time Monday talking about China.

His administration filed a new trade complaint against China with the World Trade Organization on Monday. The White House is challenging Chinese subsidies for auto parts.

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AUDIE CORNISH, HOST:

From NPR News, this is ALL THINGS CONSIDERED. I'm Audie Cornish. We begin this hour with President Obama on the campaign trail. He was in the battleground state of Ohio today, but he spent much of his time talking about China. President Obama even announced a new trade complaint against China during a campaign stop in Cincinnati.

Dr. Ilse Levin specializes in internal medicine, but you could say she really focuses on incarceration medicine.

Anthropologists believe early humans evolved in Africa and then moved out from there in successive waves. However, what drove their migrations has been a matter of conjecture.

One new explanation is climate change.

Anthropologist Anders Erikkson of Cambridge University in England says the first few hardy humans who left Africa might've gone earlier but couldn't. Northeastern Africa — the only route to Asia and beyond — was literally a no man's land.

Canada's leaders have ended their country's longstanding resistance to asbestos being called a dangerous material under United Nations guidelines, a decision that reflects a shift in the leadership of Quebec province, home of Canada's asbestos industry.

Quebec's incoming premier, Pauline Marois, promised late in her campaign that she would shut down the region's asbestos mines for good. She says that she will use money that would have gone to restart the mines to diversify the local economy.

As Dan Karpenchuk reports for NPR's Newscast unit: