Instructables

Uma maneira mais que fácil de fazer as Hélices para uma turbina:

PVC pipe blades and rotor for HAWT from scrap. - More DIY How To Projects

http://www.instructables.com/id/PVC-pipe-blades-and-rotor-for-HAWT-from-scrap/

Um Painel Solar desdobrável:

newbox.TV 

 

http://www.instructables.com/id/How-I-built-a-folding-15-Watt-Solar-Panel/

...E Robots Magnéticos, que trepam paredes, literalmente:

newbox.TV 

http://www.instructables.com/id/Wallbots-Autonomous-Magnetic-Robots-that-Traverse/