Dr. Sileshi Semaw, a paleontologist based at Indiana University and a team of scientists announced on Wednesday, January 19, 2005
that remains discovered from the Gona Study Area in northern Ethiopia are a critical link in deciphering the evidence for human bipedalism,
or upright walking. The fossil remains -- Ardipithecus ramidus -- are said tobe dated to a 4.3 to 4.5 million years old,