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3 teens invented a salt-powered refrigerator that doesn't need electricity. They're building 200 of them for hospitals to use.
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3 teens invented a salt-powered refrigerator that doesn't need electricity. They're building 200 of them for hospitals to use.

The Thermavault refrigeration unit can keep vaccines cool with a reusable salt solution. The teens who built it plan to test it at 120 hospitals.

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