Sharon Adl-Doost once hung up on John Travolta. She sang with Rosie O'Donnell. She has had Bruce Willis, Donna Karan, Diana Ross and Ralph Lauren call her number. Sharon Adl-Doost, curvaceous hillbilly from Georgia, is one of modern America's biggest underground stars, and the most unlikely. For 30 years, she spent her days flipping burgers at the US Geological Survey (USGS) cafeteria in Reston, Virginia. One ...