Dark Age Ahead is a 2004 book by Jane Jacobs describing what she sees as the decay of five key "pillars" in "North America": community and family, higher education, science and technology, taxes and government responsiveness to citizen's needs, and self-regulation by the learned professions. She argues that this decay threatens to create a Dark Age unless the trends are reversed. Jacobs characterizes a Dark Age as a "mass amnesia" where even the memory of what was lost is lost.