Nevertheless the course of development has left us of this age in a plight. When we say that a subject of science is technically specialized, or that it is highly “abstract,” what we practically mean is that it is not conceived in terms of its bearing upon human life. All _merely_ physical knowledge is technical, couched in a technical vocabulary communicable only to the few. Even physical knowledge which does affect human conduct, which does modify what we do and undergo, is also technical and remote in the degree in which its bearings are not understood and used. The sunlight, rain, air and soil have always entered in visible ways into human experience; atoms and molecules and cells and most other things with which the sciences are occupied affect us, but not visibly. Because they enter life and modify experience in imperceptible ways, and their consequences are not realized, speech about them is technical; communication is by means of peculiar symbols. One would think, then, that a fundamental and ever-operating aim would be to translate knowledge of the subject-matter of physical conditions into terms which are generally understood, into signs denoting human consequences of services and disservices rendered. For ultimately all consequences which enter human life depend upon physical conditions; they can be understood and mastered only as the latter are taken into account. One would think, then, that any state of affairs which tends to render the things of the environment unknown and incommunicable by human beings in terms of their own activities and sufferings would be deplored as a disaster; that it would be felt to be intolerable, and to be put up with only as far as it is, at any given time, inevitable.