A brilliant, mind-bending time travel paradox from 1951. Jerome Boell is an engineer who builds a time machine, travels to the future, meets his older self, and retrieves an atomic generator that he will later claim to have invented. The problem: the generator only exists because his past self will take credit for it, creating a closed causal loop where no one is truly the inventor. Boell becomes both creator and creation, trapped in a paradox that defies conventional understanding of cause and effect. The story builds genuine tension as he grapples with the implications of his actions, and it leaves readers questioning the nature of knowledge, progress, and whether invention is ever truly original. Del Rey writes with sharp economy, making the most of his premise in a short space. It's a cult classic of early time travel fiction that still resonates because it asks the same question that haunts modern discussions of AI and innovation: when a creation references itself, who or what is really responsible?
