The well on my grandparents' farm was shallow and often went dry in a summer drought. Water was, consequently, a precious commodity which my grandmother used very carefully. I remember visiting as a child with my baby brother and watching her get the very last drop of good out of a pail of water. First she gave the baby a bath, then she reused the water to wash her hair, a batch of diapers had the next turn, and finally she poured the water on the rose bushes by the back door.
College classroom time is also a precious commodity: there is so much to teach in so little time. Choosing what will be of most value to students is a constant challenge for agriculture teachers because of a continually changing agricultural knowledge base. It takes skill to choose what is important to teach and to teach it in a manner that will enhance maximum learning.