Wordwide machines are costly and food is cheap. An enormous social problem is the rural poor, mostly tropical. The disease centers are really Africa, India & Southeast Asia. The role of rural poverty looms repeatedly, reaching Chiapas, Nicaragua and elsewhere. This endemic role attracts do-gooders, anthropologists and revolutionaries. These are the populations with tropical diseases plaguing their other problems that highlight a) little or no water and drainage, b) lack of electricity and c) unemployment, aside from possibly having little food.