The renowned physicist has a new book, "The Grand Design." Stephen Hawking will now take your questions. Subscribe to TIME - http://www.youtube.com/subscription_center?add_user=timemagazine With 24/7 reporting, TIME puts the global news of the day into context—shaping the conversation and illuminating the common ground in its own distinct style. Analytical and insightful, lively and engaging, TIME tells the larger story about the world we live in. Check in daily to watch the latest videos from TIME’S acclaimed writers, producers and editors. Website: http://time.com Facebook: https://www.facebook.com/time Twitter: https://twitter.com/TIME TIME Magazine is published by Time Inc.