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I think we can start some ultra-sonic generators out there that will go through the wet soil and kill all vegetation within a given range. We might clear away the jungle for half a mile or so and then use ultra-sonic beams to help it clear while new food-plants are tried out." Tommy's eyes glowed. "You've given yourself a job! We'll turn this planet upside down."
And there is some hope that one of my friends may show you, in ultra-sonic vibrations, a weapon against the jungle itself. My own work is finished. But I ask again for friendship for my planet Earth. I ask that no war be made on my own people. I ask that what benefits you receive from us be passed to the other surviving cities on the same terms.
A new idea which would lessen the demands of the machines was a godsend to these folk. Then Denham blew a smoke ring and said meditatively: "I think I've got something too, Tommy. Ultra-sonic vibrations. Sound waves at two to three hundred thousand per second. Air won't carry them. Liquids will. They use 'em to sterilize milk, killing the germs by sound waves carried through the fluid.
Indoor-Outdoor Climatizers sniffles, he said, kept killing his sales presentation even though his record was good enough. Ultra-sonic toothbrushes, then, were a fine product. Only the vibration, with his gold inlay, seemed to give him headaches after every demonstration. He didn't have a gold inlay. But the headaches were real enough. So he quit.
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