Grandpa?
by Edward M. Lerner
Professor Thaddeus Fitch gives a practical demonstration of the grandfather paradox to
his physics classes.
Imagine that I had the technology with which to visit my grandfather in his youth. Once
there, what is to stop me from killing him before he’d had the opportunity to
reproduce? But if I did succeed, who was it who had travelled backward. .
.
“Grandpa?” by Edward M. Lerner, in Analog,
July/August 2001.