While sorting through the attic, elderly Mike Sakler finds a note from himself detailing how
he must go back in time to save his grandfather from a mugging near the 1939 New York
World’s Fair.
Indeed the notes from that page on were most curious. “Planck energy for opening gap in
spacetime fabric = 10
19 billion electron volts,” read one, but then that was
crossed out with a large X as the writer of the notes took a different tack.