Making bricks in the third world.

A machine to make bricks with less concrete, in the third world.

http://www.popsci.com/technology/article/2013-05/building-blocks

An acquaintance just returned from Guatemala where she built ovens for rural folk - who otherwise burn 10-fold more wood (or plastic or whatever they get their hands on) in open indoor fire pits, yielding terrible air quality. Local charities pre-organized delivery of bricks, but I bet this machine would make it more economical overall.