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Why cosmologists worry about isolated brains that randomly fluctuate into existence.
George Ellis explains why the study of the cosmos poses some very deep questions.
How many rational solutions can you find on a doughnut?
The Fields medallist reveals the beauty of numbers, how he drew inspiration from Sanskrit maths and a Rubik's cube, and how his maths fits with his tabla playing.
Asking good questions is an important part of doing maths. But what makes a good question?