What makes our genetic ancestry so compelling?

Genealogy is all the rage. The TV series "Who Do You Think You Are?" indulges the curiosity of celebrities about their roots and is a big hit. Many people look to their family trees for exciting and surprising discoveries about their ancestors, or to clear up long-standing questions about family history. Talking with Ed Kessler, Denis Alexander and Tara Zammit unravel the arguments.

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