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In the household aisle of any grocery store, one can find a variety of sprays, soaps and wipes that say they can help eliminate our homes and our bodies of germs. And as the cold and flu season approaches, making sure we stay bacteria free is important. But the effectiveness of these products is up for debate. We'll talk about the germs that are out there and the best ways to fight them off. Laura's guests are Mary Roach, science writer and author of a recent essay on germs and Dr. Charles Gerba, microbiologist at the University of Arizona.