Most archaeologists believe human ancestors arrived in America around 15,000 years ago. But a new study out this week analyzed mastodon bones found in San Diego, and concluded that early humans were breaking those bones 130,000 years ago. Steve Holen, a research associate at the San Diego Natural History Museum and a co-author of the study, joins us to talk about the controversial findings.
Study: Humans Lived in San Diego Area 130,000 Years Ago

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