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Busting myths of origin.

New studies show that there is no such thing as "pure" European—or anyone else. Almost all of us are the children of repeated ancient migrations, according to researchers who study ancient human origins. Indigenous Europeans, for example, descend from at least three major migrations in the past 15,000 years, including two from the Middle East. Those migrants swept across Europe, mingled with previous immigrants, and then remixed to create the peoples of today. Using revolutionary new methods to analyze DNA and the isotopes found in bones and teeth, scientists are exposing the tangled roots of peoples around the world, as varied as Germans, ancient Philistines, and Kashmiris. Few of us are actually the direct descendants of the ancient skeletons found in our backyards or historic homelands. Only a handful of groups today, such as Australian Aborigines, have deep bloodlines unaffected by mixing with immigrants.