A time-travel experiment goes very badly awry.

This is a very poor story. Asimov wrote it for Larry Shaw, who handed him the title (sans exclamation point) and got him to make up the story on the spot. Randall Garrett wrote “Blank?” and Harlan Ellison “Blank” with the same challenge. So forgettable a story is it, that when the time came to review it, my mind drew a—well, I couldn’t remember anything about it. And rereading it, I can see why.

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