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Rund Abdelfatah and Cristina Kim try to unravel the mystery of a Soviet scientist who was helping to spread the word about nuclear winter theory—until he disappeared. This is a peek at the kind of exclusive bonus content Throughline+ supporters get every month. Want more like this? Sign up via Apple Podcasts or at plus.npr.org/throughline . And thank you! See pcm.adswizz.com for information about our collection and use of personal data for sponsorship and to manage your podcast sponsorship preferences. NPR Privacy Policy