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    Stephen Hawking defying time and space at 70

    Al Jazeera English

    by Al Jazeera English

    British scientist Stephen Hawking, who turns 70 on Sunday, is regarded as one of the most brilliant physicists since Einstein.

    His achievements include theories of time and space and the nature of black holes.

    Another of his great triumphs is how he has defied the medical odds, celebrating his birthday, 47 years after doctors predicted he would die.

    Al Jazeera's Andrew Potter reports.