The designer has an obligation to provide an appropriate conceptual model for the way that the device works. It doesn't have to completely accurate but it has to be sufficiently accurate that it will help in both the learning of the operation and also dealing with novel situations.

Scientists are always skeptics.

Learning should take place when it is needed, when the learner is interested, not according to some arbitrary, fixed schedule

Market segmentation s a natural result of the vast differences among people

It was always amusing to be inside Apple and read what journalists said we were doing

Our information lives will be better served when we are free to get to our information from wherever we are, with any device available.

A big ethical question is what happens after people stop using the device. Does it degrade the environment? Could it have been designed so it would actually be good for the environment?