There's an upside to the end of the space shuttle program: Now that the shuttle has been grounded, NASA can turn its attention to acres of contaminated soil and groundwater, the result of chemical spills from shuttle launches. And they're doing it in a novel way: with an oil-based emulsion that's made of corn and looks like dressing. The technique was first designed in scribbles on the back of a napkin, perhaps after eating a salad.