appropriate technology definition https://en.wikipedia.org/wiki/Appropriate_technology examples: http://passipedia.org/basics/what_is_a_passive_house http://www.thefullbellyproject.org/products/universalnutsheller.aspx
appropriate technology http://archive.cooperhewitt.org/other90/other90.cooperhewitt.org/Design/q-drum.html https://stuff.mit.edu/afs/athena/course/other/d-lab/DlabIII06/sugarcane-charcoal.pdf http://solarcooking.wikia.com/wiki/Pot-in-pot_cooler http://www.cnet.com/news/sunlight-powers-streetlights-wi-fi-access/