The intellectual takes as a starting point his self and relates the world to his own sensibilities; the scientist accepts an existing field of knowledge and seeks to map out the unexplored terrain. ↗
Of all the problems which were open to me for study, typhus was the most urgent and the most unexplored. We knew nothing of the way in which contagion spread. ↗
When you get into the whole field of exploring, probably 90 percent of the kinds of organisms, plants, animals and especially microorganisms and tiny invertebrate animals are unknown. Then you realize that we live on a relatively unexplored plan. ↗