As head of TED, Chris Anderson believes it's within our grasp to turn outrage into optimism. It comes down to reimagining one of the most fundamental human virtues: generosity. What if generosity could become infectious? Consider how a barber began offering haircuts to people experiencing homelessness and catalyzed a movement. How two anonymous donors gave $10,000 each to two hundred strangers and discovered that most recipients wanted to "pay it forward" with their own generous acts. In telling these stories, Anderson offers a playbook for how to embark on our own generous acts and prime them to have world-changing impact.