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A major health challenge for people living in tropical and subtropical regions of the developing world is the “cold chain,” the need to refrigerate certain vaccines and drugs, particularly insulin. It’s a nearly impossible-to-fill requirement in poor, technology-starved countries. But a solution is on the horizon. With members of his laboratory, Dr. Michael Weiss has invented a new type of insulin that is ultra-stable and fully active for many months, even at temperatures above 100o F.