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

Dhruv Chaudhary, Mithran Ladhania, and Mridul Jain worked together to build a salt-powered refrigerator.

Dhruv Chaudhary/Mithran Ladhania/Mridul Jain

• 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 won the 2025 Earth Prize of $12,500 and plan to test 200 units in 120 hospitals.

Three teenagers designed a mini...