French Denis Thevenin shows his invention, a unique system for viewing ones head and hair, set with light and portable mirrors to use for comb, coloring, make-up, shaving, during the opening day of the 36th International Exhibition of Invention, on April 2, 2008 in Geneva. More than 700 exhibitors from 45 countries are present at the World's largest exhibition devoted to innovation in the world. By Fabrice Coffrini/Getty. 

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