Rotor_Head
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Washington, June 12 : In a new research, scientists have described the aerodynamic secret of twirling seeds of maple trees, which might have implications for the design of swirling parachutes and micro-helicopters.
http://us.rd.yahoo.com/dailynews/rss/searc...ws-1-54771.html
http://us.rd.yahoo.com/dailynews/rss/searc...ws-1-54771.html