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    Yes, but what are neutrinos for?

    Seven schemes for putting an elusive particle to use

    Ray Jayawardhana is an astrophysicist and author of the new book “Neutrino Hunters: The Thrilling Chase for a Ghostly Particle to Unlock the Secrets of the Universe” (Scientific American/Farrar, Straus & Giroux). He will be speaking at a Museum of Science author salon in Cambridge on Wednesday, Dec. 11.