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3:08
Alan Dershowitz discovers the crucial role his family's synagogue played during WWII.
5:17
Watch Bill O'Reilly in "The Irish Factor," Finding Your Roots: Season Three.
0:56
Watch Soledad O'Brien in "The Irish Factor," Finding Your Roots: Season Three.
1:57
Watch Bill Maher in "The Irish Factor," Finding Your Roots: Season Three.
0:23
Secrets encoded in their genomes challenge guests’ ideas about their family histories.
3:13
Jessica Alba learns more about her Mexican-American family's immigration experience.
2:26
Thanks to a mysterious helper, Carole King's Polish grandparents gained entry to the US.
2:52
Nas encounters his 3rd Great-Grandmother's Bill of Sale, a devastatingly telling document.
2:55
Valerie Jarrett digs into the family history of her legendary Great-Grandfather.
3:03
Angela Bassett follows her ancestors' journey from slavery through emancipation.
2:48
Professor Gates' team visited China to confirm the Ming Tsai family genealogy.
1:26
Tom Colicchio meets his Italian ancestors.
