Based on various evidence - including stone tools, fossil bones and genetic analysis - other researchers have offered a range of possible dates for human arrival in the Americas, from 13,000 to 26,000 years ago or more. Most scientists believe ancient migration came by way of a now-submerged land bridge that connected Asia to Alaska. The findings may shed light on a mystery that has long intrigued scientists: When did people first arrive in the Americas, after dispersing from Africa and Asia?
