When he was 21, Stephen Hawking learned he had motor neurone disease.
Doctors told him he had a few years to live.
Here are a dozen quotes showing Hawking’s approach to science and to life.
'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.'
'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.'
'One, remember to look up at the stars and not down at your feet. Two, never give up work. Work gives you meaning and purpose, and life is empty without it. Three, if you are lucky enough to find love, remember it is there and don't throw it away.'
'When we understand string theory, we will know how the universe began. It won't have much effect on how we live, but it is important to understand where we come from and what we can expect to find as we explore.'
'It is no good getting furious if you get stuck. What I do is keep thinking about the problem but work on something else. Sometimes it is years before I see the way forward. In the case of information loss and black holes, it was 29 years.'
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