“Last year, Americans over age 18 averaged 3,530 hours with all forms of media — playing video games, paging through magazines, watching television and DVDs and chatting online. Books captured just 108 of those hours, about 3 percent. From that narrow perch, books stubbornly cling to an outsized importance. So while American lives grow more wired, books remain — barnacle-like — as the weighty coin in the marketplace of ideas.”