Just a few weeks ago, computer prodigy China Mack's typical night in involved Endor Star Wars pajamas and a sensible bedtime. Now she's dating gorgeous tech guru Jackson Cooper--one of Forbes 's Top Ten Eligible Billionaires--much to the Twitterverse's delight. Turns out, going from socially inept hermit to poster girl for geek chic has its challenges. China's relationship gets even more complicated because her role heading the top-secret Vigilance...