CNNW Sanjay Gupta MD May 6, 2012
television series called "finding your roots" on pbs, and i said, sure, absolutely. you see, i was born in michigan, but my parents were born and they grew up in india. like a lot of immigrants, they thought they would never be able to learn their whole family history. that was lost, they thought, in the old country. i always wondered and so i gave professor gates the names of my immediate relatives along with a cheek swab of my dna. here's some of what he found. >> reporter: to dig even deeper, we sent sanjay's cousin to hardwar, located on the ganges river. it's a place of tremendo...