Paleoanthropology.  Scientists spar over claims of earliest human ancestor.
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D000818:Animals; D001842:Bone and Bones / Q000033:anatomy & histology; D005270:Femur Head / Q000033:anatomy & histology; D005580:Fossils; D019015:Geologic Sediments; D015186:Hominidae / Q000033:anatomy & histology; D006801:Humans; D007630:Kenya; D008963:Molar / Q000033:anatomy & histology; D010161:Paleodontology; D011187:Posture; D016138:Walking