'How We'll Live on Mars': Q&A with Author Stephen Petranek

Stephen Petranek, an award-winning journalist and technology forecaster, thinks people will be living on Mars within 20 years. Petranek states his case in a new book called "How We'll Live on Mars" (Simon & Schuster/TED, 2015). Complementing Petranek's TED talk of the same name, the book paints a picture of humanity's first journey to the Red Planet, which he sets in 2027, and describes the key technologies needed to reach, survive and thrive on the planet and exactly how that process would