Human Relative

This undated photo shows Callao Cave on Luzon Island of the Philippines, where the fossils of Homo luzonensis were discovered. This view is taken from the rear of the first chamber of the cave, where the fossils were found, in the direction of the second chamber. In a study released Thursday, scientists report that tests on two samples from the species show minimum ages of 50,000 years and 67,000 years. (Callao Cave Archaeology Project via AP)