Probing the universe’s mysteries, Stephen Hawking proved the power of the human spirit

Stephen Hawking overcame the loss of his working limbs and voice to become the best-known theoretical physicist of his era, upending the scientific consensus that nothing escapes the intense...

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JUDY WOODRUFF: Let's take some time now to get a fuller look at the life and work ofStephen Hawking.The British physicist pressed on in the face of adversity to become, some say, one of themost important scientists in history.Hari Sreenivasan will talk about this with Miles O'Brien.But Miles begins with this appreciation, which is, naturally, the focus of this week's segmenton the Leading Edge of science.MILES O'BRIEN: His was a brilliant mind in a severely damaged body.Stephen Hawking overcame the loss of working limbs, and his own voice, to become the bestknown theoretical physicist of his era.STEPHEN HAWKING, Theoretical Physicist (through computer voice): Although my body is verylimited, my mind is free to explore the universe, to go...