Stephen J. Gould has put this as well as anyone else:
  In the American vernacular, "theory" often means "imperfect fact"--part of
a hierarchy of confidence running downhill from fact to theory to hypothesis
to guess. Thus the power of the creationist argument: evolution is "only" a
theory and intense debate now rages about many aspects of the theory. If
evolution is worse than a fact, and scientists can't even make up their
minds about the theory, then what confidence can we have in it? Indeed,
President Reagan echoed this argument before an evangelical group in Dallas
when he said (in what I devoutly hope was campaign rhetoric): "Well, it is a
theory. It is a scientific theory only, and it has in recent years been
challenged in the world of science--that is, not believed in the scientific
community to be as infallible as it once was."
  Well evolution is a theory. It is also a fact. And facts and theories are
different things, not rungs in a hierarchy of increasing certainty. Facts
are the world's data. Theories are structures of ideas that explain and
interpret facts. Facts don't go away when scientists debate rival theories
to explain them. Einstein's theory of gravitation replaced Newton's in this
century, but apples didn't suspend themselves in midair, pending the
outcome. And humans evolved from ape-like ancestors whether they did so by
Darwin's proposed mechanism or by some other yet to be discovered.

  Moreover, "fact" doesn't mean "absolute certainty"; there ain't no such
animal in an exciting and complex world. The final proofs of logic and
mathematics flow deductively from stated premises and achieve certainty only
because they are not about the empirical world. Evolutionists make no claim
for perpetual truth, though creationists often do (and then attack us
falsely for a style of argument that they themselves favor). In science
"fact" can only mean "confirmed to such a degree that it would be perverse
to withhold provisional consent." I suppose that apples might start to rise
tomorrow, but the possibility does not merit equal time in physics
classrooms.

  Evolutionists have been very clear about this distinction of fact and
theory from the very beginning, if only because we have always acknowledged
how far we are from completely understanding the mechanisms (theory) by
which evolution (fact) occurred. Darwin continually emphasized the
difference between his two great and separate accomplishments: establishing
the fact of evolution, and proposing a theory--natural selection--to explain
the mechanism of evolution.

  - Stephen J. Gould, " Evolution as Fact and Theory"; Discover, May 1981



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