In which John Heilemann talks with Steven Johnson, New York Times best-selling writer on science, technology, and their intersection with human behavior. Heilemann and Johnson discuss his latest book, Extra Life: A Short History of Living Longer, and the new four-part PBS documentary series of the same title based on the book, which explore what Johnson calls "one of our greatest achievements: the doubling of global life expectancy over the past century;" the historical roots of the anti-vax movement; the importance of networks of collaboration in discovery and what he regards as the myth of the "lone genius;" the cholera epidemic in London in the mid-1800s and what we can learn from it today; and the rarely examined environmental consequences of our great strides in public health. Johnson also shares his qualms about the possibility that medical advances might—just might—allow us to live forever.

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