One million years after the invention of writing, Three-Phasing (nominally male) brings a 20th century man and his wife forward in time to teach the ancestors of man how to read.
“Pleasta Meetcha, Bob. Likewise, Sarah. Call me, uh. . .“ The only twentieth-century language in which Three-phasing’s name makes sense is propositional calculus. “ George. George Boole.”

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  1. “Anniversary Project” by Joe Haldeman, in Analog, October 1975.
    2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . written by Joe Haldeman