by
Harl Vincent
Bill Bonwitt, the young chief engineer at the mercury mines that bored into the surface of Earth's moon at the crater Tycho, knew something was wrong. His hob-nailed boots beat a swift tattoo on the metal steps as he quick-footed down to the radio room."Crane!" he yelled to the operator. "Have you felt it?"His friend grinned up from the ethertype m..