If one develops good habits and routines, it is possible to be a responsible educator most of the time; and to marshal the special energies and reflection for those times, when the correct course of action is not clear, or when one is weighing one wrong against another wrong.

In the United States these days, 'diversity' is a big word and a buzzword.

The biggest mistake of past centuries in teaching has been to treat all students as if they were variants of the same individual and thus to feel justified in teaching them all the same subjects the same way.

In every part of the world with which I am familiar, young people are completely immersed in the digital world - so much so, that it is inconceivable to them that they can, for long, be separated from their devices. Indeed, many of us who are not young, who are 'digital immigrants' rather than 'digital natives,' are also wedded to, if not dependent on, our digital devices.

A person who is app-dependent is always searching for the best app; and as soon as its routine has been executed, the person searches for the next app. A person who is app-enabled also uses apps frequently. But he or she is never limited by the current array of apps; apps will free the person to do what he or she wants to do, or needs to do, irrespective of the next application of the app. An app-enabled person can also put devices away, without feeling bereft.

As a planet, we are at risk of destruction (for example, gradually by the warming of the planet; or rapidly, by nuclear war or a pathogen that gets out of control). And these threats require us to work together, and not just to announce our diversity.

An individual understands a concept, skill, theory, or domain of knowledge to the extent that he or she can apply it appropriately in a new situation.