Cold. For centuries we've fought it, shunned it and huddled against it. Cold has always been the enemy of life, but now it may hold the key to a new generation of science and technology that will improve our lives. David Pogue explores the frontiers of cold science, from saving the lives of severe trauma patients and cooling a warming planet to ultracold physics, where bizarre new properties of matter are the norm and the basis of new technologies like levitating trains and quantum computers. In this brave new world, cold isn't to be avoided. Cold is the new hot.