From the behaviour of black holes to a theory that distils the history of the universe - chart the discoveries that have made one of the world's most recognisable physicists famous.
The pursuit of a single theory that describes our Universe - trace the career and influences of Stephen Hawking, our 2016 Reith lecturer (http://bbc.in/1lKiqn5)
The human race faces one its most dangerous centuries yet as progress in science and technology becomes an ever greater threat to our existence, Stephen Hawking has warned.
Speaking ahead of his BBC Reith Lecture on black holes, Stephen Hawking discusses the danger inherent in progress and the chances of disaster on Earth
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