Not long ago, most paleoanthropologists thought that intercontinental travel was reserved for hominids who were big of brain and long of limb. Until very recently, the fossil evidence suggested that early humans did not journey out of Africa until they could walk long distances and were smart enough to invent sophisticated tools. Then, 2 years ago, a team working at Dmanisi, Georgia, shook up those ideas. It reported finding two small skulls dated to a surprisingly ancient 1.75 million years ago and associated with only primitive stone tools (Science, 12 May 2000, p. 948). Now, on page 85 of this...