The limitation of speed to the velocity of light;
the indeterminancy principle of quantum physics
are discoveries of the limitations of physics.
the statistical prediction of future observations is an analogous limitation
so is
the identity of species,
the lack of specificity of pharmaceuticals, e.g. antibiotics, steroids
the outcome of the projects of molecular biology
must be expected to be attended with analogous certainties
and uncertainties.
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Darwinism as an assertion of individuality as
opposed to the socialism implicit in political and religious movements.
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The problem of expressing abstract ideas in language,
e.g. realism, perception. Such notions must be buttressed by
experience.
Biologists take reality for granted is to say that for them it
is a meaningless term, and as a meaningless term describes
something that does not exist.
That the hairs and feathers are in fact uncountable does not
trouble the biologist.