Archaeologists have uncovered almost two hundred stone artifacts, including projectile points and flake tools, and bone fragments from large mammals at the Cooper’s Ferry site in western Idaho, the United States. The discovery suggests that humans lived in the area 16,000 years ago, more than a thousand years earlier than scientists previously thought. They therefore arrived in the Americas before an inland ice-free corridor had opened. The projectile...
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![Cyclo[18]carbon. Image credit: Kaiser et al.](https://cdn.sci.news/images/2019/08/image_7503f-Cyclocarbon-195x110.jpg)
