Happy Birthday to Stephen Hawking!
The celebrated physicist is 71 years old today. One of our era’s most brilliant minds, he has contributed both to cosmological science as well as to the public’s understanding of the natural world. All this despite being diagnosed with Lou Gehrig’s disease 50 years ago, a diagnosis that usually means one has years to live, not decades. He is an example of both the strength of the human spirit and the power of the human mind.
Celebrate by watching his 1992 film A Brief History of Time, free in its entirety, at Open Culture.
Oh, and it’s also Elvis Presley’s birthday or something.




![Stephen Hawking at 70: Fellow Scientists Pay Tribute
His peers and colleagues offer tributes, including:
He fits in as a person who dares to go out on the leading edge. One of the scientists today at this conference said, thank you Stephen for making life so difficult for us. What he meant by that was coming up with theories that send everybody scurrying, it just throws a spanner into the works. It challenges everybody all the time and that’s one of his greatest contributions. - Kitty Ferguson
I think he is simply a miracle of nature and, of course, he did a lot of influential things that helped us theorists, from entropy in black holes to Hawking radiation. The combination of his handicapped position combined with his enormous psychological and rational state is fantastic. - Jiri Bicak
It is amazing that [his work] came from somebody with his condition, but it’s even more amazing that it came from one person at all. - Steven Carlip
(via The Guardian)](http://25.media.tumblr.com/tumblr_lxht5myndO1qbh26io1_1280.jpg)




