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The scientific genius of leonardo da vinci is brought to life through this articulated model. The invention that inspired this snaptogether replica is taken from the pages of da vinci's priceless and aweinspiring notebooks. This model is made of plastic snaps together and requires no special tools. The manual is very educational and teachs how this invention has evolved into what it is today. The aerial screw designed by leonardo da vinci was a precursor of the modern day helicopter. The device was designed to compress air in order to obtain flight. No batteries required.