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Until now, the fastest vaccine ever made - for mumps - took four years. And while our current effort to develop a covid-19 vaccine involves thousands of people working around the clock, the mumps vaccine was developed almost exclusively by one person: Maurice Hilleman. Hilleman cranked out more than 40 other vaccines over the course of his career, including 8 of the 14 routinely given to children. He arguably saved more lives than any other single person. And through his work, Hilleman embodied the instincts, drive, and guts it takes to marshall the human body’s defenses against a disease. But through him we also see the struggle and the costs of these monumental scientific efforts. This episode was reported by Matt Kielty and Heather Radke, and produced by Matt Kielty. Support Radiolab by becoming a member today at Radiolab.org/donate.    

What if someone asked you to get infected with the COVID-19 virus, deliberately, in order to speed up the development of a vaccine? Would you do it? Would you risk your life to save others? For months, dozens of companies have been racing to create coronavirus vaccines. Finally, three have done it. But according to the experts, we’re not out of the woods yet; we’ll need several vaccines to satisfy the global demand. One way to speed up the development process is a controversial technique called a human challenge trial, in which human subjects are intentionally infected with the virus. Senior correspondent Molly Webster gets the lowdown from Public News Service reporter Laura Rosbrow-Telem and then tracks down some of the tens of thousands of people who have volunteered to participate in a challenge trial. Special thanks to Jonathan Miller. This episode was reported by Molly Webster and Laura Rosbrow-Telem and produced by Molly Webster and Pat Walters. Support Radiolab by becoming a member today at Radiolab.org/donate.    

Lies, liars, and lie catchers. This hour of Radiolab asks if it's possible for anyone to lead a life without deception.