There are plans underway to eliminate waste in our nation's parks -- one cup at a time. The plan is the brainchild of the National Park Foundation, working with International Paper and the National Recycling Coalition. The Park Foundation will replace plastic and Styrofoam cups with International Paper's biodegradable "ecotainers" displaying messages about conservation and environmental stewardship...

All over the Midwest, farmers are cranking up their combines for the corn harvest. Modern agriculture depends on science and technology at every step of the way, from genetically modified crops, to the fertilizer on the fields, to the fuel in the tractor. We begin today?s show with a look at nitrogen fixation, a process that?s credited both with feeding the world and making modern warfare possible. Next, producer Amy Coombs invesigates how scientists are finding secondary uses for the byproducts of biodiesel. Our executive producer Audra Wolfe wraps up the show with a look at the chemical cycle of life, through compost. Element of the Week: Nitrogen.