I like the verb that de Camp coined for forward time travel—vanwinkling—but when the hero, De Witt, chases Hedges back in time, they start changing things and everyone (including them) remembers both the old time and the new. It’s beyond me to grok that form of time travel, but I give credit for creativity.
The problem of backward-jumping has not hitherto been solved. It involves an obvious paradox. If I go back and slay my own grandfather, what becomes of me?

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  1. “The Best-Laid Scheme” by L. Sprague de Camp, Astounding, February 1941.
    2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . written by L. Sprague de Camp