As early humans spread out across the world, their toughest challenge was colonizing the Americas — because a huge ice sheet blocked the route. It has long been thought that the pioneers, known as Clovis people, arrived about 13,000 years ago, but an underwater discovery in Mexico suggests people arrived earlier than previously thought — and by boat, not on foot. How closely related were these First Americans to today’s Native Americans? It’s a controversial matter, focused on Kennewick Man. Few other skeletons engender such strong feelings.
Part 1 • 2015 • History
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 - 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.
Part 3 • 2015 • History