"In practical terms, [journalist Kara Oehler] tells us, this has meant that the researchers piled into a 1996 Subaru and started visiting Main Streets. The first trip took them from Boston to Chicago. Kara notes that street interviews – vox pops – usually yield one response out of three. 'But everyone talks to you on Main Street.' From May to August, the team travelled 12,000 miles, stopping at hundreds of Main Streets."