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.

Study finds human ancestors made tools continuously for 300,000 years

Hear KUOW and NPR award-winning hosts and reporters from around the globe present some of the nation's best reporting  of the day's events, interviews, analysis and reviews.

Hear KUOW and NPR award-winning hosts and reporters from around the globe present some of the nation's best reporting of the day's events, interviews, analysis and reviews.

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Study finds human ancestors made tools continuously for 300,000 years

Study finds human ancestors made tools continuously for 300,000 years