Patented by Sharklet Technologies, a Florida-based biotech company, the film, which is covered with microscopic diamond-shaped bumps, is the first "surface topography" proven to keep the bugs at bay. In tests in a California hospital, for three weeks the plastic sheeting's surface prevented dangerous microorganisms, such as E. coli and Staphylococcus A, from establishing colonies large enough to infect humans. Bacteria have an easier time spreading out on smooth surfaces, says CEO Joe Bagan: "We think they come across this surface and make an energy-based decision that this is not the right place to form a colony." Because it doesn't kill the bacteria, there's also little chance of the microbes evolving resistance to it. Hey, it's worked for sharks for 400 million years.