How Amazon’s Algorithms Curated a Dystopian Bookstore

Among the best-selling books in Amazon’s Epidemiology category are several anti-vaccine tomes. One has a confident-looking doctor on the cover, but the author doesn’t have an MD—a quick Google search reveals that he’s a medical journalist with the “ThinkTwice Global Vaccine Institute.” Scrolling through a simple keyword search for “vaccine” in Amazon’s top-level Books section …