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It is seen that both matter and radiation possess a remarkable duality of character, as they sometimes exhibit the properties of waves, at other times those of particles. Now, it is obvious that a thing cannot be a form of wave motion and composed of particles at the same time - the two concepts are too different.
Now that virtually every career is an option for ambitious girls, it can no longer be considered regressive or reactionary to reintroduce discussion of marriage and motherhood to primary education. We certainly do not want to return to the simplistic duality of home economics classes for girls and wood shop for boys.
