Sudden Emergence of Bipedalism: 3.7 Million-Year-Old Laetoli Footprints Challenge Evolutionary Model

MSNBC, "Walk this way: What prehistoric footprints reveal" July 20, 2011; http://www.msnbc.msn.com/id/43827874/ns/technology_and_science-science/

Subjects: Evolutionary Trees, TCM - Human Origins