The 'SmartBird', an ultralight flight model of German manufactor FESTO flies during the opening ceremony of the "Hannover Messe" industrial trade fair in Hanover April 3, 2011. The world's leading fair for industrial technology, with about 6,500 exhibitors from 65 nations, runs till April 8 with France as this year's partner country. REUTERS/Morris Mac Matzen (GERMANY - Tags: POLITICS SCI TECH BUSINESS)