FILE — Stephen Hawking, the physicist and author, at the Royal Society in London, July 20, 2015.
FILE — Stephen Hawking, the physicist and author, at the Royal Society in London, July 20, 2015. TOM JAMIESON NYT
FILE — Stephen Hawking, the physicist and author, at the Royal Society in London, July 20, 2015. TOM JAMIESON NYT