of your house. Just that. But right then, you don't care. You jump out and start pulling out that atomic generator and taking it inside.

It isn't hard to disassemble, but you don't learn a thing; just some plates of metal, some spiral coils, and a few odds and ends—all things that can be made easily enough, all obviously of common metals. But when you put it together again, about an hour later, you notice something.

Everything in it is brand-new and there's one set of copper wires missing! It won't work. You put some #12 house wire in, exactly like the set on the other side, drop in some iron filings, and try it again.

And with the controls set at 120 volts, 60 cycles and 15 amperes, you get just that. You don't need the power company any more. And you feel a little happier when you realize that the luggage space wasn't insulated from time effects by a field, so the motor has moved backward in time, somehow, and is back to its original youth—minus the replaced wires the guard mentioned—which probably wore out because of the makeshift job you've just done.

But you begin getting more of a jolt when you find that the papers are all in your own writing, that your name is down as the inventor, and that the date of the patent application is 1951.

It will begin to soak in, then. You pick up an atomic generator in the future and bring it back to the past—your present—so that it can be put in the museum with you as the inventor so you can steal it to be the inventor. And you do it in a time machine which you bring back to yourself to take yourself into the future to return to take back to yourself....

Who invented what? And who built which?

Before long, your riches from the generator are piling in. Little kids from school are coming around to stare at the man who changed history and made atomic power so common that no nation could hope to be anything but a democracy and a peaceful one—after some of the worst times in history for a few years. Your name eventually becomes as common as Ampere, or Faraday, or any other spelled without a capital letter.

But you're thinking of the puzzle. You can't find any answer.

One day you come across an old poem—something about some folks calling it evolution and others calling it God. You go out, make a few provisions for the future, and come back to climb into the time machine that's waiting 

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