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Fossils Reveal Human Ancestors' Hearing Abilities

Two-million-year-old fossils including the three tiny bones of the middle ear are helping scientists figure out the auditory abilities of early human ancestors at a time when they were beginning to hear more like a person and less like a chimpanzee. A study published Friday involving two species from South Africa, Australopithecus africanus and Paranthropus robustus, showed they boasted better hearing than either chimps or people in a frequency range that may have facilitated vocal...

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