Paul Feyerabend, former philosophy professor at the University of California (Berkeley) explains how in the history of science many theories have arisen, been accepted as established, promoted as the truth, and then eventually discarded. Feyerabend further maintains that scientific data promoted by scientist in support of a theory are anything but neutral because every scientist has an agenda. In all fields of science questions remain open as scientific theories are regularly tweaked. Moreover, the scientific establishment is regarded as very much [[Politically correct|politicized]]. Thus, scientists regularly work with unproven assumptions{{#tag:ref|cf.''The assumption is now known to be only a very rough approximation to the truth. ...The assumption will serve as a reasonable working hypothesis until it leads to contradictions. ... The second principle is a sheer assumption. It seems plausible and it appeals strongly to our sense of proportion. ... ''<ref name="Observational Approach">{{cite web | Paul Feyerabend, former philosophy professor at the University of California (Berkeley) explains how in the history of science many theories have arisen, been accepted as established, promoted as the truth, and then eventually discarded. Feyerabend further maintains that scientific data promoted by scientist in support of a theory are anything but neutral because every scientist has an agenda. In all fields of science questions remain open as scientific theories are regularly tweaked. Moreover, the scientific establishment is regarded as very much [[Politically correct|politicized]]. Thus, scientists regularly work with unproven assumptions{{#tag:ref|cf.''The assumption is now known to be only a very rough approximation to the truth. ...The assumption will serve as a reasonable working hypothesis until it leads to contradictions. ... The second principle is a sheer assumption. It seems plausible and it appeals strongly to our sense of proportion. ... ''<ref name="Observational Approach">{{cite web |