The "hobbit" had neighbors. Back in 2004, researchers announced the discovery of this tiny, ancient human, which apparently hunted dwarf elephants with stone tools on the Indonesian island of Flores 18,000 years ago. Its discoverers called the 1-meter-tall creature Homo floresiensis, but skeptics wondered whether it was just a stunted modern human. In the years since, researchers have debunked many of the "sick hobbit" hypotheses. Yet scientists have continued to wonder where the species came from. Now, an international team originally led by the hobbit discoverer reports stone tools, dated to 118,000 to 194,000 years ago, from another Indonesian island,...