"I wanted to create a way to automatically dim the refrigerator light to a lower level during the night," said an inventor, ...

Three teens from India created a refrigerator that doesn’t need electricity to work. The Thermavault uses salt to stay cool. The creators aim to help rural areas that don’t have access to electricity.

Three teens built a salt-powered fridge to help bring vaccines and medical supplies to rural areas. The invention uses salts that pull heat from their environments when they dissolve in water. They ...