It's the kind of simple yet brilliant invention that would have the tycoons of Dragons' Den salivating with excitement.
Not only is the fridge solar powered, it can also be built from household materials - making it ideal for the Third World.
Emily Cummins, 21, came up with the idea while working on a school project in her grandfather's potting shed. The fridge is now improving the lives of thousands of poverty-stricken Africans.
And Miss Cummins hopes to patent a more sophisticated portable model for use in transporting medical supplies around hot countries.
From the age of four, when she was given a hammer as a gift, Miss Cummins has spent much of her spare time making things out of ordinary materials.
She has won awards for a toothpaste squeezer for arthritis sufferers and for a water-carrying device, again for Third World use.
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