In the nineteen-eighties and nineties, Bill Gates was the best known of a new breed: the tech mogul—a coder who had figured out how to run a business, and who then seemed to be running the world. Gates was ranked the richest person in the world for many years. In a new memoir, “Source Code,” he explains how he got there. The book focusses on Gates’s early life, and just through the founding of Microsoft. Since stepping away from the company, Gates has devoted himself to his foundation, which is one of the largest nonprofits working on public health around the globe. That has made him the target of conspiracy theories by anti-vaxxers, including Robert F. Kennedy, Jr., who has asserted that Gates and Anthony Fauci are together responsible for millions of deaths during the COVID-19 pandemic. Gates views the rise of conspiracy thinking as symptomatic of larger trends in American society exacerbated by technology. “The fact that outrage is rewarded because it’s more engaging, that’s kind of a human weakness,” he tells David Remnick. “And the fact that I thought everybody would be doing deep analysis of facts and seeking out the actual studies on vaccine safety—boy, was that naïve. When the pandemic came, people wanted some evil genius to be behind it. Not some bat biology.