New York Times bestselling author of The Know-It-All and The Year of Living Biblically , A.J. Jacobs undergoes a hilarious, heartfelt quest to understand what constitutes family--where it begins and how far it goes--and attempts to untangle the true meaning of the "Family of Humankind." A.J. Jacobs has received some strange emails over the years, but this note was perhaps the strangest: "You don't know me, but I'm your eighth cousin. And we have over...