A review by paulbrad25
Pendulum by Henry Hasse, Ray Bradbury

3.0

A apocalyptic vision delivered through nesting devices; the arrival on Earth of aliens investigating the demise of the human race, and their discovery of the writings of a wrongfully convicted scientist who had been imprisoned in the eponymous pendulum and accidentally imbued with immense longevity with which he is able to bear witness to the robot uprising and eventual destruction.
A lot to squeeze into nine pages, and the story does not linger.