On Saturday, members of the scientific community, family, friends and fans gather to remember the life and legacy of groundbreaking physicist Stephen Hawking. Hawking died on March 14 at his home in Cambridge, England, at the age of 76. For decades, Hawking enchanted scientists as well as science lovers with groundbreaking discoveries about the origins of the universe and then translated those ideas to millions of non-scientists worldwide. His career and his life were celebrated as a medical miracle. He was born in 1942 in Oxford, Great Britain. At age 21, he was diagnosed with a neuromuscular disease known as Lou Gehrig's disease. Doctors said he had only a few years to live. Instead, he lived for more than 50 years, traveling the world in his motorized wheelchair and communicating through a custom computer-controlled speech synthesizer. His only complaint was that the synthesizer gave him an American accent. He also protested against US wars, including the US war in Vietnam and the US invasion of Iraq. We're talking to Kitty Ferguson, author of two books on Hawking, "Stephen Hawking: An Unrestrained Mind" and "Stephen Hawking: Finding a Theory of Everything."