Posted in Uncategorized A 130,000-Year-Old Mastodon Threatens to Upend Human History 2021-07-13 Leave a Comment on A 130,000-Year-Old Mastodon Threatens to Upend Human History Ancient tools scattered around a mastodon suggest that the earliest humans showed up in North America more than 100,000 years earlier than we thought. Source: A 130,000-Year-Old Mastodon Threatens to Upend Human History