A talk by one of our favourite physicists about Einstein, relativity and gravitational waves.

Monday 23 June 2014 would have been Alan Turing's 102nd birthday. One of the 20th century's great mathematicians, Turing made profound contributions to a wide range of fields including computer science, artificial intelligence and mathematical biology, and played a key role in the codebreaking work at Bletchley Park during World War II. Learn more about his life and mathematical work with these articles and video.

We've read the book. We've bought the T-shirt. And now, finally, here it is: the movie of one of our favourite maths problems