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What lies in the roots of your family tree? The online genealogy industry is booming, as evidenced by Ancestry.com's success. - 

Ancestry.com -- one of the most popular online family tree websites -- announced that it will buy rival website Archives.com for around $100 million.

How did the world of online genealogy become such big business?

Here to talk with us in today's Mid-day Extra is Diane Haddad, managing editor at Family Tree Magazine.

Follow Jeremy Hobson at @jeremyhobson