How big is infinity? How small is an electron? When will the Sun destroy the Earth? How fast is a nerve impulse in your brain? Why can't you see inside a black hole? What's the hottest temperature ever recorded on Earth? What's the furthest you can see on a clear night? With their characteristic panache and unrivalled clarity, world-renowned science authors Mary and John Gribbin take us on an incredible, thought-provoking and often scarcely believable (but of course all true) whistle-stop tour of everything you ever wanted to know about science.