What happened when early humans ventured out of Africa and into Asia? Where did they go and whom did they meet along the way? The latest evidence suggests they left far earlier than previously thought and interbred with other types of ancient human such as Homo erectus, Neanderthals and also the Denisovans, whose existence was established only five years ago when geneticists extracted DNA from a tiny fragment of finger bone. Because these ancient humans mated with our ancestors, their genes have found a home in our DNA. More than that, they've helped us survive and thrive.

Originally released by Public Broadcasting Service (U.S.), 2015. Streaming video file encoded with permission for digital streaming by Infobase on February 13, 2017.

First Asian(2:19) -- Luang Prabang (3:14) -- Migration Out of Africa (3:50) -- Migration Routes (3:10) -- Climate Migration (3:14) -- Artifacts (2:59) -- Chinese Discoveries (3:04) -- Interbreeding (4:51) -- Denisova Cave (3:24) -- Denisovans (4:01) -- Overlapping Genes (1:57) -- Tibetan DNA (4:43) -- Carotene Origins (2:18) -- Human DNA (2:01) -- Disease Fighting Genes (4:04) -- Gene Migration (3:15) -- Credits: First Peoples: Asia (0:31).