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Murky Birth
The origin of Homo is a dimly understood stage in our evolutionary journey, and the view that A. sediba is the ancestor of our genus will not go unchallenged. One obstacle: fossil fragments also bearing hints of Homo, possibly half a million years older.
PHOTOS: DAVID LIITTSCHWAGER (HOMO SAPIENS); DK LIMITED/CORBIS (H. ERECTUS); NATURAL HISTORY MUSEUM, LONDON/IMAGE WORKS (H. HABILIS); BRENT STIRTON (A. SEDIBA); SINCLAIR STAMMERS, PHOTO RESEARCHERS, INC. (A. AFRICANUS); BLOOMBERG/GETTY IMAGES (A. AFARENSIS)

SOURCE: LEE R. BERGER, UNIVERSITY OF THE WITWATERSRAND