Heat the oil and butter in a frying pan and gently fry the garlic with the leeks and thyme leaves (if using) for 3-4 minutes, or until the leeks are soft. Stir in the milk, cream and parsley ...

Hannah Fry follows the numbers on thrilling journeys of data and discovery. Along the way we meet the remarkable people who dug into the data and unearthed something extraordinary. Mathematician ...