The common name that entomologists give fruit flies is "vinegar flies." That's because they're naturally attracted to fermented liquid, and when fruit rots, it also ferments. But fruit flies don't thrive only on rotten fruit or vinegar. They also love sugary substances like soda, wine and beer, and you can find them at the bottom of your trash bin or any wet place with a substantial food source. "Substantial food source" may mean something different to you than to the small but mighty fruit fly, said Jody Green, an entomologist at the University of Nebraska-Lincoln. "It may not be the food y