The early settlement of the Americas is hugely contested area of archaeology.
This was an area in which early anatomically modern humans survived, evolved and thrived, before spreading out of Africa to other continents.
Fossil footprints are a treasure chest of information.
Human tracks registered in aeolianites - cemented dune surfaces - are rare at a global level.
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.
Walking has taken a very long time to develop, with evidence of bipedalism among early humans in Africa roughly 4.4 million years ago.
The New Mexico findings could rewrite the history of human migration to the Americas.
Artificial intelligence could help police catch criminals – but we need human experts for the big cases.
These ancient surfaces, which often preserve the tracks in remarkable detail, are now amenable to inspection and interpretation.
Some 13,000 years ago, an adult carrying in a child walked 1.5km in mud at great speed in the presence of hungry predators.
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.