It was November 24, 1974, and the sun stood scorchingly overhead. I had intended to devote this Sunday morning to bringing my field notes up-to-date. But Tom had persuaded me to relocate a spot where we had collected fossil animal bones the year before. We spent some time surveying, gathered up what bones we found, and started back toward the Land-Rover. As we walked, I glanced over my shoulder — and there on the ground I saw a fragment of an arm bone. My pulse was quickening. Although the bone was very small, it lacked the characteristic bony flange of a monkey. Suddenly I found myself saying, "It's ' hominid!" Something else caught my eye. "Do you suppose it belongs with those skull fragments?" It was high noon that memorable day when the realization struck us both that we might have found a skeleton...