Ancient human ancestor Lucy was not alone — she lived alongside at least 4 other proto-human species, emerging research suggests - Livescience.com

Editor's note: This article is part of a special package written for the 50th anniversary of the discovery of a 3.2 million-year-old A. afarensis fossil (AL 288-1), nicknamed "Lucy."
About 3.2 milli… [+6403 chars]