At the northern tip of the Philippine island of Luzon lays Callao Cave, an expansive, seven-chamber limestone warren. Researchers report today they have uncovered the bones of a now-extinct, previously unknown human species near the far end of the first chamber. The discovery adds to growing evidence that human evolution and dispersal out of Africa is much more complicated than scientists once thought and and reinforces the importance of Southeast Asia in the history of our species. The rese