They can be very efficient for conveying information. I&#x27;m not a strong fan of videos (as some friends of mine are) as substitutes for texts on a subject. On the same side, lectures aren&#x27;t enough either. They&#x27;re all different aspects of the same thing: expressing information to others. If we move away from traditional texts, I like the idea of &quot;smart&quot; books. These would be interactive (where appropriate) in demonstrating concepts or guiding students through exercises (such as a proof or stepping through an algebra problem one step at a time). However, I think in the end (my opinion) <i>good</i> books are irreplaceable as sources of information, and should be aided by lectures, videos, tutoring and interactive apps.