Here's China's impossible plan to build the world's tallest building in…

By next March, a 220-floor skyscraper will stand in Changsha that will measure 838 meters (2,749 feet) in height, what will be the world's tallest building. And amazingly, construction hasn't even begun. While it took Dubai more than five years to build the Burj Khalifa building — what is currently the world's… » 11/22/12 6:30am 11/22/12 6:30am