Jon Bohmer is a a Norwegian-born entrepreneur based in Kenya, and also an  inventor  who has created a solar cooker made of cardboard. And the interesting thing is, this solar cooker cost only 5 Euros.  He has named his invention the Kyoto Box – after the international environmental treaty to reduce global warming.

Kyoto Box - Solar Cooker made from cardboard.

The ingeniously simple design uses two cardboard boxes, one inside the other, and an acrylic cover that lets in the sun’s rays and traps them.

Black paint on the inner box, and silver foil on the outer one, help concentrate the heat. The trapped rays make the inside hot enough to cook casseroles, bake bread and boil water. You can boil 10 litres of water in 2 hours. Bohmer won the first prize of $75000 from the Forum for the Future, for his ingenious invention.

Source : CNN