That knowledge is problematic--difficult to establish, labile once created,
often imprecise and always subject to the limitations of the human mind--is
not the discovery of postmodernism. It is a foundational insight of the age
of science, of fact and information, itself.... The point is not that facts
do not exist, but that they are unstable (and are becoming more so as the
pace of science quickens). Knowledge is always an attempt. Every fact was
established by an argument--by observation and interpretation--and is
susceptible to being overturned by a different one. A fact, you might say,
is nothing more than a frozen argument, the place where a given line of
investigation has come temporarily to rest.