TRIBE CHALLENGES AMERICAN ORIGINS
Dr Silvia Gonzalez conducted a study of ancient bones found in Mexico and found that they have very different characteristics to Native Americans.
The results are being presented at the BA Festival of Science this week.
Some of the ancient skulls she has looked at are more than 12,000 years old.
These skulls have long and narrow heads that are very different from the short, broad skulls of today's Native Americans.
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Bron: BBC News