Testing Blood to Track History

An ambitious and controversial genetics project that uses blood to trace the migration patterns of ancient humans faces a possible boycott as it launches this week.
The Genographic Project will collect 100,000 blood samples from indigenous populations and analyze their DNA. Through this project, researchers hope to answer questions about where the aborigines of Australia came from, or whether it's true that Alexander the Great fathered the blue-eyed blonds who have been in Afghanistan for more than 2,000 years.
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