Our prehistoric human ancestors relied on deliberately modified and sharpened stone tools as early as 3.3 million years ago.

Ailsa Chang speaks with David Braun, an archeologist, about his team's discovery of a site in Kenya that suggests human ancestors built tools continuously much earlier than previously thought. So when ...

Archaeologists working in eastern England say they have uncovered the earliest known evidence of humans deliberately making fire, pushing the origin of this technology back to roughly 400,000 years ...