One of two sets of bones from Australopithecus Sediba, found in South Africa are unveiled at the University of the Witwatersrand in Johannesburg, Thursday, Sept. 8, 2011. The bones offer the most powerful case so far in identifying the transitional figure that came before modern humans, finding some are are calling a potential game-changer in understanding evolution. (AP Photo/Denis Farrell)

Associated Press
One of two sets of bones from Australopithecus Sediba, found in South Africa are unveiled at the University of the Witwatersrand in Johannesburg, Thursday, Sept. 8, 2011. The bones offer the most powerful case so far in identifying the transitional figure that came before modern humans, finding some are are calling a potential game-changer in understanding evolution. (AP Photo/Denis Farrell)
One of two sets of bones from Australopithecus Sediba, found in South Africa are unveiled at the University of the Witwatersrand in Johannesburg, Thursday, Sept. 8, 2011. The bones offer the most powerful case so far in identifying the transitional figure that came before modern humans, finding some are are calling a potential game-changer in understanding evolution. (AP Photo/Denis Farrell)
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