Edward M. Lerner - Grandpa

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First published in Analog, July 2001

NOTICE: This work is copyrighted. It is licensed only for use by the original purchaser. Making copies

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The lecture hall was pleasantly warm. Behind professor Thaddeus Fitch, busily writing on the

chalkboard, pencils scratched earnestly in spiral notebooks, fluorescent lights hummed, feet shuffled. A

Beach Boys tune wafted in through open windows from the quad.

“And so,” he continued, “travel backwards in time would violate causality, and hence appears to be

impossible.” He turned to face the class. “The problem is most commonly illustrated with the

‘Grandfather Paradox.’

“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 traveled backward...”

A collective gasp interrupted his lecture. As Thaddeus realized that the students were all staring at his

chest, he glanced downward to see a red dot glowing on his white shirt. The professor next noticed, in

the back row of the hall, a young man who seemed to be aiming some sort of pistol at him. The would-be

sniper's hand seemed to shake in unison with the wobbling of the red spot.

The young man was not enrolled in the Introduction to Physics class, yet he looked somehow familiar to

Thaddeus. Perhaps it was the angle at which he cocked his head, or the shock of bright red hair, or the

piercing green eyes. In a rush ofpresque vu , Thaddeus recognized a version of himself.

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Edward M. Lerner - Grandpa

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