Harvard scholar Henry Louis Gates, Jr. explores America's immigrant tapestry as he seeks answers to two simple questions: "What made America?" and "What makes us?" In this four-part series, Gates unravels the genealogy and genetics of 11 famous Americans, including: poet Elizabeth Alexander, chef Mario Batali, comedian Stephen Colbert, novelist Louise Erdrich, writer Malcolm Gladwell, cellist Yo-Yo Ma, film director Mike Nichols, Her Royal Highness Queen Noor, actress Eva Longoria, actress Meryl Streep, figure skater Kristi Yamaguchi, and TV personality Dr. Mehmet Oz. (Source: PBS)