How do you fight a pandemic? With cutting edge technology. Two of the new Covid-19 vaccines applying for FDA approval rely on a novel approach that uses mRNA to turn the human body into an internal vaccine factory. CNN Chief Medical Correspondent Dr. Sanjay Gupta talks to mRNA researcher Dr. Drew Weissman about the groundbreaking science behind these new vaccines and what it might mean for the future of medicine. To learn more about how CNN protects listener privacy, visit cnn.com/privacy