Gravity. That was something he could do. Docchi turned, took two steps before the surge of gravity hit him. It came in waves, the sequence of which he was never able to disentangle. The first wave staggered him; at the second his knees buckled and he sank to the floor. After that his eardrums hurt. He thought he could feel the ship quiver. He knew dazedly that an artificial gravity field of this magnitude was impossible, but that knowledge didn't help him move. It vanished as suddenly as it had come. Painfully his lungs expanded. Each muscle ached. He rolled to his feet and lurched past Jordan. He didn't find the mass of broken flesh he expected. Anti was already standing. "Oof!" she grunted and gazed with satisfaction at the twisted grotesque shape at her feet. The electronic brain had been smashed, the body flattened. [Illustration] "Are you hurt?" asked Docchi gently, awed. She waggled the extremities of her body. "Nope, I can't feel anything broken," she said solemnly. She moved back to get a better view of the robot. "I'd call that throwing my weight around. At the right time, of course. The secret's timing. And I must say you picked up your cue with the gravity well." Her laughter rolled through the ship. "It wasn't I," said Docchi. "Jordan? No, he's just getting up. Then who?" "Nona," said Docchi. "It had to be her. She saw what had to be done and did it. But how she got that amount of gravity--" "Ask her," said Anti with fond irony. Docchi grimaced and limped back into the control room, followed by Anti and Jordan. Nona was at the gravity panel, her face pleasant and childlike. "Gravity can be turned on or off," said Docchi puzzledly, searching her face for some sign. "And regulated, within certain narrow limits. But somehow you doubled or tripled the normal amount. How?" Nona smiled questioningly. "Gravity engineers would like to know that too," said Jordan. "Everybody would like to know," Anti interrupted irritably. "Except me. I'm too pragmatic, I suppose, but I want to know when we start the rockets and be on our way." "It isn't that easy," sighed Jordan. "A retracted combustion cap in flight generally means at least one burned-out tube." He made his way to the instrument panel and looked at it glumly. "Three." "A factor." Docchi nodded. "But I was thinking about the robot." Anti was impatient. "An interesting subject, no doubt. What about it?" "Where did it get instructions? Not radio; the hull of the ship cuts off all radiation. The last we knew, it was in our control." "All right, how?" "Voice," said Docchi. "Cameron's voice, to be exact." "But he was in the rocket dome," Jordan objected. "Think back to when we were loading the tank. We had to look through the telecom and the angle of vision was bad. We couldn't see much of the cargo lock. Anti couldn't see anything that wasn't directly overhead. Both Cameron and the geepee managed to get inside and we didn't know it."