This podcast excerpt from CBC's "Understood" features Cory Doctorow interviewing Steven Levy, author of a book on Google, and Clive Thompson about the history of search engines. The discussion begins with early, inefficient search engines and their reliance on keyword stuffing. It then transitions to Google's revolutionary PageRank algorithm and its initial success, highlighting the founders' initial aversion to advertising. The interview details Google's development of AdWords, its impact on search results, and the evolution of Google's approach to advertising.