Sam Hassan, an American-born Lebanese Muslim, and Toufic Hajjar, a Lebanese-born Christian, have known each other since the 1940s, when they shared friends, language and culture in Quincy Point, a ...

Build a Family Tree (Men Only) by Marti Louw The Y chromosome is the keeper of family history on the male side. Written in the letters of DNA, it carries a record of a man's paternal ancestors.

To build this family tree, or genealogy, researchers sifted through thousands of genome sequences collected from both modern and ancient humans, as well as ancient human relatives, according to a ...