Research on ancient footprints has previously challenged what's known about when people arrived in North America, and a new discovery could shed more light on the story.
원문출처 : https://www.cnn.com/2022/08/05/world/utah-ice-age-human-footprints-discovery-scn/index.html
원문출처 : https://www.cnn.com/2022/08/05/world/utah-ice-age-human-footprints-discovery-scn/index.html