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People have tried with a regular heat source. But a solar concentrator could work .https://en.wikipedia.org/wiki/Vaccine_cooler https://en.wikipedia.org/wiki/V
by abdullahkhalids 7y ago
People have tried with a regular heat source. But a solar concentrator could work .https://en.wikipedia.org/wiki/Vaccine_cooler https://en.wikipedia.org/wiki/Vaccine_cooler