Ancient Americans migrated in a single wave from Siberia

Two new DNA studies shed light on the migration of ancient people into the Americas, including 'surprising' links to present day Australo-Melanesians.  The first study reveals that Native American ancestors reached the New World in a single, initial migration from Siberia at most 23,000 years ago, only later differentiating into today's distinct groups.  A second study reveals that some Amazonians descend from forefathers more closely related to the Indigenous peoples of Australia, New Guinea and the Andaman Islands than present-day fellow Native Americans.