Researchers from the University of Arizona swabbed shopping cart handles in four states looking for bacterial contamination. Of the 85 carts examined, 72 percent turned out to have a marker for fecal bacteria. The researchers took a closer look at the samples from 36 carts and discovered Escherichia coli, more commonly known as E. coli, on 50 percent of them - along with a host of other types of bacteria. Shopping cart handles aren't the only thing you need to worry about when you go to the local supermarket, Gerba added. In other research, he's found that reusable shopping bags...