To see video demonstrations of key concepts from the book, please visit this website: http://www.press.uchicago.edu/sites/timewarp/ Sci-fi makes it look so easy. Receive a distress call from Alpha Centauri? No problem: punch the warp drive and you're there in minutes. Facing a catastrophe that can't be averted? Just pop back in the timestream and stop it before it starts. But for those of us not lucky enough to live in a science-fictional universe,...