Many of us are lured by the promise of self-improvement, but find it hard to follow through. In our 100th episode, TED speakers reveal ways to discover our better selves, from simple hacks to deep introspection. TED speakers include entrepreneur Jia Jiang, Headspace co-founder Andy Puddicombe, psychologist Emily Balcetis, technologist Matt Cutts, and New York Times columnist David Brooks.