Non-toxic and cheap thin-film solar cells for 'zero-energy' buildings
The Papp Engine - Update on John Rohner.

Its time for the pulse motor build off 2016. I highly recommend this having been a former judge. It more about an exercise in the imagination, being resourceful and in some cases engineering skills. The video tells the story.

I like the catch phrase “Competition through Cooperation

Non-toxic and cheap thin-film solar cells for 'zero-energy' buildings
The Papp Engine - Update on John Rohner.