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New technology may bypass the need to keep vaccines cold by stabilizing them with silk. NOVA Facebook: https://www.facebook.com/NOVAonline NOVA Twitter: https://www.twitter.com/novapbs PRODUCTION CREDITS Produced by Ari Daniel and Kristen Clark Narrated by Ari Daniel Original Footage © WGBH Educational Foundation 2014 MEDIA CREDITS (International Video) © Bill & Melinda Gates Foundation (Map) Wikimedia Commons/PhilippN (CC by 3.0) (Viruses) © Brent Johnson (Silk Micrograph) Courtesy of Alpretec MUSIC Free Music Archive/BOPD (CC by 3.0) IMAGE (main image: Handheld Vial) Ari Daniel and Kristen Clark