Y-chromosomal Adam: My Original Ancestor

My story begins with my first known ancestor, Y Chromosomal Adam. He’s the first “anatomically modern human” (as the evolutionary-biologists call them!), the one man whom science has taught us that I’m descended from. Oh, and all other modern humans, too. (Ignore the number of years ago it says: I don’t know how to make it say 170,000 years ago!).