He was lying in the grass and his cute little cocker spaniel was nibbling on his ear when the message came. He was breathing the fragrant air of spring and feeling cool spring breeze and the solid earth under the grass beneath him, while the dog with doleful eyes delighted him with her tricks. His name was Oscar Nance, and he was the world's top archaeologist. That was why the message came to him when the UN began selecting a crew for Earth's first expedition to Mars. "We want you," the message