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When Stephen Hawking was diagnosed with motor neurone disease aged just 21, he was given only a few years to live. But the British scientist marks his 70th birthday on Sunday, as questioning as ever.
Despite spending most of his life crippled in a wheelchair and able to speak only through a computer, the theoretical physicist's quest for the secrets of the universe has made him arguably the most famous scientist in the world.
"I'm sure my disability has a bearing on why I'm well known," Hawking once said. "People are fascinated by the contrast between my very limited physical powers, and the vast nature of the universe I deal with."
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