Carl Imhoff on president Obama pledged three billion dollars in U.S. stimulus funding to transform the old electric grid into a Smart Grid.

Catherine Badgely believes that organic farming can help farmers increase their local productivity, and the well-being of their own local communities.

Greenbaum is president of the Health Effects Institute, an independent research organization heavily funded by the EPA studies greenhouse gases.

Renewable energy may be the ideal, but it doesn't happen overnight. "In the meantime, we must start managing the CO2 emissions from fossil fuel emitting power stations, refineries, steel plants, and so on. And carbon capture and storage is the only technology that allows us to do that," says John Barry.

"There's a very tense, polarizing debate between people who believe big agribusiness and organics are enemies of each other," says Jon Foley, "The world needs both and we need the lessons from both."

Listen to Peter Moeller talk about a sea sponge he discovered that could help fight antibiotic-resistant bacteria.

Elke Anklam talks about the possible pros and cons of using nanotechnology in food products. The FDA is assessing their safety.

Karen Goldberg says her guiding principles are to create less waste, fewer toxins, and more energy efficiency in chemicals and fuels.

Reza Fazel found that CT scans and nuclear medicine scans tests that use radioactive tracers inside the body contribute the most to higher doses of radiation.

All animals have cycles of daily activity, called circadian rhythms. It's run by an internal biological clock that senses when the day begins and ends.