Where's George? (web adress www.wheresgeorge.com) is a website that tracks the natural geographic circulation of American paper money. Its popularity has led to the establishment of a number of other currency tracking websites (of which Where's George? remains the most popular by far), sites that track other objects—such as used books—and it has been used in at least one research paper to provide statistical patterns of human travel in the United States. The site's creater, Hank Eskin, founded the site on December 23, 1998. The site's name originates from George Washington, the person on the $1 bill. The site allows the tracking of $1 bills as well as $2, $5, $10, $20, $50, and $100 bills. The most popularly entered bill is the $1 denomination, followed by the $20.