That was why he was so surprised when he opened his eyes to see the terry perched by his bed with a neat patch of gauze taped to one wing. "How in hell did you pull through, MacDuff?" he asked. "The same way as you," the lizard-bird told him. "We are voth natives of Venus." "Huh?" He raised himself waveringly on one elbow. He was lying in the Bergenson home in New Kalamazoo. They must have used Pubina's rocket ship to fly back. "What do you mean--_native_?" "Just what he says, Graff." Greta pushed open the screen-door and bustled in with a pile of linen. "You were both born on Venus. Father says that you must have had all kinds of skin abrasions as an infant: your body developed a natural immunity to Ricardo's Virus. We'll still use the vaccine on everybody else, including the children, just to be on the safe side. But Father has felt for a long time that the blood of the pioneers would adjust to its environment. When you got sick, but didn't die, you proved it." "Well, I'd like to point out," Graff said, as he sat up to permit Greta to change his sheets, "that I am very, very happy to have given your father a chance to prove that theory." MacDuff closed a lidless eye in an assenting reptilian wink.