[Not enough is known about solid geometry] and for two reasons: in the first place, no government places value on it; this leads to a lack of energy in the pursuit of it, and it is difficult. In the second place, students cannot learn it unless they have a teacher. But then a teacher can hardly be found.
Schools have not necessarily much to do with education...they are mainly institutions of control where certain basic habits must be inculcated in the young. Education is quite different and has little place in school.