The Nurture Assumption
 The Nurture Assumption: Why Children Turn Out the Way They Do is a book written by Judith Rich Harris with a foreword by Steven Pinker originally published 1998 by the Free Press which published a revised edition in 2009. It has been published in at least 20 languages. The book was a 1999 Pulitzer Prize finalist (general non-fiction). Its answer to Why Children Turn Out the Way They Do is that Parents Matter Less Than You Think and Peers Matter More.