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The difficultness of the daily tasks appears to be reliably indicated by the tendency to yawn.
2
If you have a physics degree, I think you will be more powerful because of the difficultness.
3
Clearly, then, our ignorance is due not to lack of appreciation of the scientific value of primate research but instead to its difficultness and costliness.
4
This excellent showing for the control series wholly justifies the comparison of problems 2 and 3 as to difficultness, made above.