Archaeologists found possibly 13,000-year-old Clovis sites at 9,500 feet near Yellowstone; the discovery challenges what scientists thought about ancient glaciers

Archaeologists found possibly 13,000-year-old Clovis sites at 9,500 feet near Yellowstone; the discovery challenges what scientists thought about ancient glaciers

Imagine standing at 9,500 feet in rugged mountains where, according to long-held scientific thinking, a thick cap of ice should have blocked almost all