The story begins when the universe was the size of an atom itself, and we follow it throughout its continuous transformations of matter and energy, from heat to gas, from mountains to people. The breath you just took is as likely to contain atoms from the final breath of Julius Caesar as it is to contain a virus from the cough of your child's classmate. And that same atom, 100 billion years from now, when all the stars have burned out and the sun has swallowed the earth -- that atom's life span will continue. Krauss predicts what will be spawned to soak up the fruits of our universe, and what, if anything, will survive.