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When he was 21, Stephen Hawking learned he had motor neurone disease.
Doctors told him he had a few years to live.
He's now 72 and one of the foremost physicists alive — a professor at the University of Cambridge, an investigator of black holes, and the author of the bestselling book "A Brief History of Time."
Here are a dozen quotes showing Hawking's approach to science and to life.
On disability
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"My advice to other disabled people would be, concentrate on things your disability doesn’t prevent you doing well, and don’t regret the things it interferes with. Don’t be disabled in spirit, as well as physically."
On priorities
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"My goal is simple. It is a complete understanding of the universe, why it is as it is and why it exists at all."
["Stephen Hawking's Universe," 1985]
On free will
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"I have noticed that even people who claim everything is predetermined and that we can do nothing to change it, look before they cross the road."
["Black Holes and Baby Universes and Other Essays," 1994]
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