The early settlement of the Americas is hugely contested area of archaeology.
The oldest known footprint of our species, lightly ringed with chalk. It appears long and narrow because the trackmaker dragged their heel.
Charles Helm
A new study finds more than one early human species lived on the landscape in Northern Tanzania 3.66 million years ago. But there are reasons to be cautious about the findings.
Three upright walkers, including Lucy (center) and two specimens of Australopithecus sediba, a human ancestor from South Africa dating back nearly 2 million years.
Image compiled by Peter Schmid and courtesy of Lee R. Berger/Wikimedia Commons
The footprints of over 20 different prehistoric people, pressed into volcanic ash thousands of years ago in Tanzania, show possible evidence for sexual division of labor in this ancient community.