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When it comes to big science, very few things are conclusively known. From Quantum Mechanics to Natural Selection, what we have instead are theories - ideas explain why things happen the way they do.

About the Author

Paul Parsons is former editor of BBC Focus magazine. He has written for publications from the Telegraph to FHM. His The Science of Doctor Who (Icon) was longlisted for the 2007 Royal Society Prize. Martin Rees is Astronomer Royal, President of the Royal Society, and Professor of Cosmology and Astrophysics at Cambridge.