A 130,000-Year-Old Mastodon Threatens to Upend Human History by Eric Niiler from on 2017-04-26 17:00 (#2MF8R) Ancient tools scattered around a mastodon suggest that the earliest humans showed up in North American more than 100,000 years earlier than we thought. The post A 130,000-Year-Old Mastodon Threatens to Upend Human History appeared first on WIRED.