Knot Your Grandfather’s Knot
by Howard V. Hendrix
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 = 1019 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.
“Knot Your Grandfather’s Knot” by Howard V. Hendrix,
in Analog, March 2008.