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Federal regulators signed off on the construction and operation of two nuclear reactors at a Georgia plant. It's the first license to be granted for a new reactor in the U.S. since 1978. Nuclear expert Per Peterson discusses the reactors' design, safety features and what this means for the future of nuclear power.

In his book Concrete Planet, author Robert Courland discusses why the concrete first used by the Romans is more durable than the concrete used in most present day buildings. Plus, mineralogist Peter Stemmerman tells us about his invention, Celitement and why it is greener than Portland cement.

Before setting foot in Michigan, Rick Santorum was leading in GOP polls there. It's the clearest illustration yet that the traditional rules that determine primary winners have been upended by factors that are new this time around, such as superPACs and the proliferation of candidate debates.

Military bases in the California desert could host seven gigawatts of solar power installations--roughly equivalent to the output of seven nuclear plants--according to a study commissioned by the Department of Defense. Study director Robert Kwartin discusses the report.

The protests come a little more than a week before the country's first election in five years.

Research that produced genetically altered bird flu viruses that could pose a danger to people should remain on hold for now. But a panel of experts recommended the details of the experiments should be published.

It's natural for Leonard Cohen to think a lot about mortality near the end of his life, but Ron Sexsmith says Cohen has never sung about "frivolous things."

With yet another outbreak of sprout-related illness, sprouts growers they need the FDA to provide new rules so they can test new techniques for reducing risk.

The dominant role of Germany in the Greek bailout has triggered special venom in Greece. Melissa Block talks to Nikos Konstandaras, managing editor of the leading Greek daily Kathimerini, about the tensions between the Greeks and the Germans. He says Greek frustration with the demands of the European Union have spilled over into a war of words between some of his countrymen and some Germans, tapping the collective memory of the German occupation.

The governor said an issue this important should be put up for a vote.