The full rev metaphor got me for a few seconds - but then I realized: if the analogy works, then those kids are not challenged enough. An engine can go over-rev

The full rev metaphor got me for a few seconds - but then I realized: if the analogy works, then those kids are not challenged enough. An engine can go over-rev very easily when the car is in neutral. And then you add some small obstacles and can go from full-rev to stalling. The problem as I see it is that the potential exists, but there is no engagement on tackling hard problems.