The Minus Woman

What made the mass of this tiny asteroid fluctuate in defiance of all known physical laws? It was an impossible fact—but then, so was the girl who they knew couldn't exist!
Red Brewer had plugged his electric razor into the lab circuit and he was running it over his pink jowls while I tried to discover what was haywire about the balance scales.
Have you noticed, Red said above the clatter of his shaver, how much less you have to shave on an asteroid?
I still shave every day, I said. There was something definitely wrong with the scales. The ten-gram weight didn't balance two five-gram weights. Instead it weighed 7.5 grams. And then, suddenly, the cockeyed scales would get ornery and the two five-gram weights would weigh 7.5 grams and the ten-gram slug would weigh what it should.
I don't, said Red. I shave once a week. Back on terra I shaved every day, but not here. And I don't even have a beard to show for it.
I didn't answer. There were tougher problems on my mind than whiskers, but of course Red Brewer wouldn't understand them. He was good at machinery, and with a camera, and for company on a lonely asteroid which right now was 300,000,000 miles from the earth, but he certainly wasn't a brain.
What do you make of it, Jay? he asked. Oh, Mr. Hayling, I'm speaking to you.
Maybe it's your thyroid, I said. Shut up.
I'm twenty-seven, said Red. Too old to have thyroids.
You mean adenoids.
Red growled and shut off the razor. He ran his hand over his face. I've got a face like a school-kid's, he said. If there was only a girl on this god-forsaken piece of rock to see it.
There were no girls on Asteroid 57GM. This place didn't have anything excepting a lonely shack with paper-thin walls made of special heat-insulating material. There wasn't a blade of grass; not a puff of wind; no soil for violets; not even a symmetrical shape, it was lopsided like a beaten-up baseball. Or at least that was what I thought until something happened to the balance scales.