An ancient bone with a projectile point lodged within it appears to up-end - once and for all - a long-held idea of how the Americas were first populated.
The rib, from a tusked beast known as a mastodon, has been dated precisely to 13,800 years ago.
This places it before the so-called Clovis hunters, who many academics had argued were the North American continent's original inhabitants.
News of the dating results is reported in Science magazine.
Read more here.
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