As far back as 22,000 years ago, humans may have improvised makeshift transportation tools that left grooves alongside their own footprints in what is now White Sands National Park in New Mexico. New ...
As Hill dived out of the way, he stumbled on what turned out to be one of the wonders of prehistoric finds: a trail of hominid footprints about 3.6 million years old. The majority of the Laetoli ...
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