Scientists have confirmed that rocks collected recently in the Moroccan desert came from the Red Planet. University of Alberta meteorite expert Chris Herd, who has acquired one of the chunks, talks about how scientists analyze space rocks, and whether organic compounds might be found inside.

Science historian Howard Markel discusses the origins of the word moon and some of the lore surrounding it, including a 1638 book by the English bishop Francis Godwin entitled The Man in the Moone, which recounts a science fiction-style voyage to the moon.

The International Maritime Organization has decreed that by 2015, all large deep sea ships will be required to carry the latest in electronic navigation equipment. But does state-of-the-art navigation technology prevent shipwrecks like last week's off the Italian coast? University of Southern Mississippi hydrographer Max van Norden talks about the technology.

Two projects aim to harness renewable energy using cutting-edge technology and engineering. AltaRock's Susan Petty discusses plans to turn hot rocks at a dormant volcano into a source of power. University of Maine's Habib Dagher talks about the potential of deepwater floating wind turbines.

Surgeons in Sweden replaced an American patient's cancerous windpipe with a scaffold built from nanofibers and seeded with the patient's stem cells. Lead surgeon Dr. Paolo Macchiarini discusses the procedure and the benefits of tissue-engineered synthetic organs.

Each tear you shed contains an army of enzymatic Pac-Men, ready to chase down and gobble up germs before they infect the sensitive tissues around your eye. Now scientists have found just one molecule of the germ-fighting enzyme is a potent defender.

U.S.-based solar panel manufacturers say inexpensive panels from China are hurting their business and want a tariff slapped on the imports. But other parts of the industry, such as installers, say the cheaper panels are driving a solar power boom in the U.S.

The Obama administration has rejected a Canadian company's permit request to build the Keystone XL pipeline. The president said he turned down the proposal because congressional Republicans gave him a 60-day deadline that did not allow for a thorough review of the project.

Now that President Obama has rejected the Keystone XL pipeline, an obvious question is what will it mean for the 2012 presidential election? The key to Keystone is which side will have the most success in framing its case to enough voters for it to make a difference.