Julia Rothman's new book 'The Where, the Why, and the How' is a science book like no other. It features artwork by 75 artists who have illustrated their answers to some of life's big questions: 'What existed before the big bang?', 'Where did life come from?', and 'Why do we age?' Each image is presented alongside an essay written by a scientist who explains the answers. My question was 'How do migrating birds and animals find their way back home?' Alex Gershenson explains that they do so in variety of ways - from using the stars for navigation, using the earth's magnetic fields, or in the case of sea turtles, by following almost indistinguishable traces of soil. The book is out now and is launched a week today in New York.