HOW WE'LL LIVE ON MARS ( # TED), STEPHEN PETRANEK

It sounds like science fiction, but award-winning journalist Stephen Pet-ranek considers it fact: within 20 years, humans will live on Mars. We'll need to. In this sweeping, provocative book that mixes business, science and human reporting, Petranek makes the case that living on Mars is an essential back-up plan for humanity, and explains in fascinating detail just how it will happen. It's clear that the race is on. Private companies (driven by iconoclastic en-trepreneurs like Elon Musk and Sir Richard Branson); Dutch reality show / space mission Mars One; NASA and the Chinese government are among the many groups competing to plant the first stake on Mars and open the door for human habitation. For Elon Musk, it's the "ultimate awesome thing.