Brian Greene, professor of physics and mathematics at Columbia University, joins us in the studio to help us get our heads around multiverse theory. His new book The Hidden Reality is out now.
Brian also poses a question that will be answered in next week's maths special podcast. Please post any other equations you need solving or mathematical questions you would like to ask on our blog (below).
Tim Jackson, professor of sustainable development at the University of Surrey and author of Prosperity Without Growth, responds to Guardian listeners' questions in a live web chat. We sat with him throughout the Q&A session.
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