Some books and other writings require more mental effort than others. How do we engage our readers? Story? Questions? What do you think? What techniques have you used? To write deliberately in this manner—to engage one’s readers in an unending conversation—takes more effort than a lecture. Could it also be more rewarding—for the generations of readers? How could you improve on this train of thought? The questions asked have to be attractive, possible to tackle, and present a heightened level of challenge.