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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. <br/><br/>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 <a href="http://plus.npr.org/throughline"target="_blank" >plus.npr.org/throughline</a>. And thank you!<em><br></em><br/><br/>Learn more about sponsor message choices: <a href="https://podcastchoices.com/adchoices">podcastchoices.com/adchoices</a><br/><br/><a href="https://www.npr.org/about-npr/179878450/privacy-policy">NPR Privacy Policy</a>