So what does a good teacher do? Create tension - but just the right amount.
I think there is a tendency in science to measure what is measurable and to decide that what you cannot measure must be uninteresting.
To me, error analysis is the sweet spot for improvement.
Scientists are always skeptics.
Simplification is as much in the mind as it is in the device.
Readers always seem to think that the author has some control over the design of their books.