News Humans In-laws transformed early human society Human culture may stem from marital twist among ancient hunter-gatherers Share this:FacebookTwitterPocketRedditPrintEmail By Bruce Bower March 10, 2011 at 6:25 pm This article is only available to Science News subscribers. Subscribers, enter your e-mail address to access our archives. Client key* E-mail* Log in Not a subscriber? Science News is a nonprofit. Support us by subscribing now. Subscribe