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The Daya Bay Reactor Neutrino Experiment, a multinational collaboration operating in the south of China, today reported the first results of its search for the last, most elusive piece of a long-standing puzzle: how is it that neutrinos can appear to vanish as they travel? The surprising answer opens a gateway to a new understanding of fundamental physics and may eventually solve the riddle of why there is far more ordinary matter than antimatter in the universe today.

As Friendster , MySpace and many other social-networking sites have discovered, a successful business finds a niche that draws in a large number of users and offers intriguing, easy-to-use services that keep those users interested. Whereas Facebook , LinkedIn and Twitter have excelled at this formula, Google's efforts in this area-- Buzz (2010), Wave (2009) and Orkut (2004)--have faltered. The search-engine giant hopes its search is over with this week's introduction of the new Google+ ( Google Plus ) network