Rebekah Cox is the product designer and manager -- and employee No. 1 -- at Quora, the community questionand- answer site started by her former Facebook colleagues Adam D'Angelo and Charlie Cheever. Cox built the front end of Quora from scratch. One of her mandates: Bake design thinking into every part of the development process. "Quora's goal is to pull knowledge out of people's heads and share it," she says. "The product itself needs to get out of the way."