Regardless of their size, today's technology companies are in the business of thinking big—really big. Ending world hunger? Solving climate change? Editing HIV out of our bodies? Blanketing the world in free internet? Building an interstellar spaceship? It's all on the table, and it's just the beginning. We'll highlight the individuals, organizations, and projects that are moving humanity forward, and scrutinize the ones who are all smoke and mirrors.