WASHINGTON (AP) — Fossilized footprints discovered in New Mexico indicate that early humans were walking across North America around 23,000 years ago.
The footprints were found in White Sands National Park in a dry lakebed.
Scientists from the U.S. Geological Survey analysed seeds embedded in the footprints and determined their age.
Based on the footprints’ size, scientists believe at least some of them were made by teenagers and children who lived during the last Ice Age.
Science published the research on Thursday.