A vaccine can look normal even after freezing; four first-year students develop a $5 electricity-free vaccine tracker, winning $9,400 for an innovation that could help protect children

Four first-year students at Imperial College London have developed a $5 electricity-free device that tracks freeze exposure in vaccine shipments, helping health workers identify potentially damaged vaccines. Their team, Kalyb, won the university's Make-A-Difference! innovation competition, receiving £7,000. The students plan to test the device in Nigeria in April 2027 to evaluate its performance under real-world transportation conditions. The innovation could help reduce vaccine wastage and strengthen immunisation programmes in regions with limited cold-chain infrastructure.