Paul Munsen, of Elburn, Ill., has traveled the world selling his Sun Ovens.
In Afghanistan, he taught a group of women how to prepare and preserve the food they grow.
"At harvest time, they sell to Pakistanis at the lowest price," he said, because they're all selling at the same time. "The Pakistanis put it in storage, and sell it later at the highest prices."
When he mentioned that solar ovens can be used to dehydrate foods, the women asked for a demonstration.