Every science presupposes decisions concerning what one would like to know; that is, what is to be learned from the scientific inquiry. In the modern science of nature, for example, it is considered worth knowing how phenomena can be produced and reproduced. The ideal of knowledge — the guiding conception of the scientific truth to be sought — is thus at the very outset that a state of affairs is understood when we can produce it; in other words, it is the acquisition of power in nature. The value judgement concerning what is worth knowing, then, precedes scientific work, lies in its background, and shows up in the objects of science only in the type of interest we take in them, which is common to them all. In particular, the pre-existing concern with domination, in the light of which all objects of natural science are seen, is itself not a theme of the prevailing science of nature. It is only in this sense that science is valuefree, or rather, value-blind.