*  Google Trends has been a source of much of my data. However, since it only allows you to compare the relative frequency of different searches but does not report the absolute number of any particular search, I have usually supplemented it with Google AdWords, which reports exactly how frequently every search is made. In most cases I have also been able to sharpen the picture with the help of my own Trends-based algorithm, which I describe in my dissertation, “Essays Using Google Data,” and in my Journal of Public Economics paper, “The Cost of Racial Animus on a Black Candidate: Evidence Using Google Search Data.” The dissertation, a link to the paper, and a complete explanation of the data and code used in all the original research presented in this book are available on my website, sethsd.com.