Maitland felt his face become hot. "Men can go anywhere, if they want to bad enough." "But _why_?" Despite his sudden irrational anger toward her, Maitland tried to stick to logic. "Living space, for one thing. The only permanent solution to the population problem...." "We have no population problem. A hundred years ago, we realized that the key to social stability is a limited population. Our economic system was built to take care of three hundred million people, and we have held the number at that." "Birth control," Maitland scoffed. "How do you make it work--secret police?" "No. Education. Each of us has the right to two children, and we cherish that right so much that we make every effort to see that those two are the best children we could possibly produce...." She broke off, looking a little self-conscious. "You understand, what I have been saying applies to _most_ of the world. In some places like Aresund, things are different. Backward. I still do not feel that I belong here, although the people of the town have accepted me as one of them." "Even," he said, "granting that you have solved the population problem, there's still the adventure of the thing. Surely, somewhere, there must be men who still feel that.... Ingrid, doesn't it fire something in your blood, the idea of going to Mars--just to go there and see what's there and walk under a new sky and a smaller Sun? Aren't you interested in finding out what the canals are? Or what's under the clouds of Venus? Wouldn't you like to see the rings of Saturn from, a distance of only two hundred thousand miles?" His hands were trembling as he stopped. She shrugged her shapely shoulders. "Go into the past--yes! But go out there? I still cannot see why." "Has the spirit of adventure _evaporated_ from the human race, or _what_?" She smiled. "In a room downstairs there is the head of a lion. Swarts killed the beast when he was a young man. He used a spear. And time traveling is the greatest adventure there is. At least, that is the way I feel. Listen, Bob." She laid a hand on his arm. "You grew up in the Age of Technology. Everybody was terribly excited about what could be done with machines--machines to blow up a city all at once, or fly around the world, or take a man to Mars. We have had our fill of--what is the word?--gadgets. Our machines serve us, and so long as they function right, we are satisfied to forget about them. "Because this is the Age of _Man_. We are terribly interested in what can be done with people. Our scientists, like Swarts, are studying human rather than nuclear reactions. We are much more fascinated by the life and death of cultures than by the expansion or contraction of the Universe. With us, it is the people that are important, not gadgets."