With no more room left on Earth, and with Mars hanging up there empty of life, somebody hit on the plan of starting a colony on the Red Planet. It meant changing the habits and physical structure of the immigrants, but that worked out fine. In fact, every possible factor was covered—except one of the flaws of human nature.... Daptine is the secret of it. Adaptine, they called it first; then it got shortened to daptine. It let us adapt. They explained it all to us when we were ten years old; I gu