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

By Henry Larson,

Kai McNamee, Ailsa Chang, Patrick Jarenwattananon

Published November 17, 2025 at 4:26 PM EST

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.

Henry Larson

Kai McNamee

Ailsa Chang

Ailsa Chang is an award-winning journalist who hosts All Things Considered along with Ari Shapiro, Audie Cornish, and Mary Louise Kelly. She landed in public radio after practicing law for a few years.

See stories by Ailsa Chang

Patrick Jarenwattananon

See stories by Patrick Jarenwattananon