The only book to investigate the parallel between what happens at other times and what happens in other possible worlds.

From Pulitzer Prize winner Brent Staples, an evocative memoir that poses universal questions: Where does the family end and the self begin? What do we owe our f

Is what could have happened but never did as real as what did happen? What did happen, but isn't happening now, happened at another time. Analogously, one can s

What do Scientists Say About Time Travel? It's fair to say that most scientists today will tell you that time travel is impossible. Three of today's top physici

"Is what could have happened but never did as real as what did happen? What did happen, but isn't happening now, happened at another time. Analogously, one can