One of the first inexplicable finds by archaeologists traveling to the future is the blue knife made of no known material brought back by Walter Toynbee who promptly dies, leaving it to his grandson to explain the origin of the knife.
I knew grandfather. He would go as far as his machine could take him. I had duplicated that. He would look around him for a promising site, get out his tools, and pitch in. Well, I could do that, too.

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  1. “As Never Was” by P. Schuyler Miller, Astounding, January 1944.
    2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . written by P. Schuyler Miller