Interrogating the universe - Stephen Hawking

View full lesson: http://ed.ted.com/lessons/questioning-the-universe-stephen-hawking In keeping with the theme of TED2008, professor Stephen Hawking asks some Big Questions about our universe -- How did the universe begin? How did life begin? Are we alone? -- and discusses how we might go about answering them. Talk by Stephen Hawking. Learn more about your ad choices. Visit megaphone.fm/adchoices