Two years to the day the great physicist Professor Stephen Hawking was interred at Westminster Abbey, and at the time of his death, we spoke to one of the people that knew him best, Leonard Mlodinow.

Leonard is an American theoretical physicist who worked with Stephen on the books The Grand Design and A Briefer History of Time, and his own book chronicling their time together, Stephen Hawking: A Memoir of Friendship and Physics (£20, Allen Lane), will be released in September this year.

In this republished interview he speaks with BBC Science Focus editor Daniel Bennett about writing together, his qualities, and what they did when they weren’t talking physics.

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