Charles Henneberg

temporal paradox n.	1962 C. Henneberg Moon Fishers in Magazine of Fantasy & Science Fiction Apr. 85/1 Some amused themselves with brain-teasers: ‘Suppose you should be so unfortunate, during a stopover in the past, as to kill your grandfather before he’d become a parent—would you exist? And if you didn’t, how could you have killed him?’ It’s what is called the temporal paradox.