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South African hominids that lived between around 2.5 million and 1.5 million years ago had an ear for high-frequency consonant sounds, anthropologist Rolf Quam of Binghamton University in New York and colleagues report September 25 in Science Advances.
Using CT scans and digital technology, Quam’s team reconstructed the ear anatomies of two Australopithecus africanus partial skulls and one Paranthropus robustus specimen. Modern human ear measurements guided virtual re-creations of soft tissue around ear bones, enabling calculations of audible sound frequencies.













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