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Families in developing countries, says Designboom, often use a system consisting of three rocks and a bundle of firewood to cook food at home. While the three-rock stove can be put together on a small budget, it only uses about 10% of the fire's heat for cooking. When the trip to get more firewood takes an entire day, conserving firewood is essential.

To create a more efficient stove, the designers at Claesson Koivisto Rune worked with families in Kenya to test prototypes and provide feedback at each stage of the design. They mimicked the function of the three-rock stove with a recycled aluminum structure that could concentrate the heat of the fire, and still use a families' existing cookware. The final product, the brightly colored Baker Cookstove, is manufactured locally in Kenya and distributed directly to villages.

In some cases, stoves are available for $29. A crowd-funding campaign is ongoing.