stuntOriginal poster said . . .
" cardboard is found throughout the world and is inexpensive, and aluminum foil is also easy to come by."
Which is typical of rich Americans and is totally wrong.
I came to this page looking for a solar cooker for Haiti. I can guarantee you that neither cardboard nor aluminum foil is readily available, even before the earthquake. And if they were, they would be used for more immediate or pressing uses. Housing, anyone?
Your designs are good for US campers. I'm not sure than you can design something that can be made from nothing.
Haitians, Indians, and Kenyans DO NOT have these materials at hand - they are the ones with the biggest need.
188.8.131.52 23:05, December 7, 2010 (UTC) Rachel H