From apps for avoiding heavy traffic to the latest polling data in the presidential race -- infographics are visual shorthand for data in the post-newspaperslash social mediaslash sound byte age. Several sources credit the digital age for giving birth to infographics and others cite the publication of USA Today’s “Snapshots” beginning in 1982. Susan Schulten begs to differ. She’s chair of thehistory departmentat the University of Denver, and author of “Mapping the Nation", she joins us today.