Dhruv Chaudhary, Mithran Ladhania, and Mridul Jain Three teenagers in Indore had watched their parents, all of whom worked in medicine, struggle with a problem that had nothing to do with treatment and everything to do with logistics: how do you keep a vaccine cold when there is no electricity for miles.Dhruv Chaudhary, Mithran Ladhania, and Mridul Jain built an answer. They called it 'Thermavault', an insulated cooling box that needs no outlet, no battery, and no ice. It runs on salt.The invention won the trio the 2025...