The remarkable thing about space-time is that it contains all the events that ever happened. It also includes all the events that ever will happen. So, in this big, 4-D space-time representation of the universe, there’s Julius Caesar getting stabbed and the Mets winning the 1969 World Series. But the coffee you are going to spill on your pants at that meeting next Tuesday is there, too . . . In fact, everything that will ever happen to you—including your death—is strung across space-time as a linked string of already existing events. Physicists call this your world line.
