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Marcus Chown is an award-winning writer and broadcaster. Formerly a radio astronomer at the California Institute of Technology in Pasadena, he is currently cosmology consultant of New Scientist. His books include Quantum Theory Cannot Hurt You, Felicity Frobisher and the Three-Headed Aldebaran Dust Devil, Tweeting the Universe and We Need to Talk to Kelvin, which was short-listed for the 2010 Royal Society Book Prize. Marcus has also tried his hand at Apps and won The Bookseller Digital Innovation of the Year for Solar System for iPad. For more, see his website... www.marcuschown.com