As adults, we experience childhood as a series of flashbacks. And those memories — however few and faulty — form the foundation of who we are. In this hour, TED speakers reflect on how our upbringing shapes us.  Tinkering School Founder Gever Tulley says that when kids are given sharp tools and matches, their imaginations take off and they become better problem-solvers.   Journalist Jennifer Senior argues that the goal of raising happy children is so elusive that it has put modern, middle-class parents into a panic. Poet and playwright Lemn Sissay was raised by the state; he talks about the empty space where his family should have been. Writer Andrew Solomon dives into his childhood to describe moments of great adversity, and how they helped him forge an identity.