> Find me someone who can't tell the difference between red and
> green

They seem to be more common than I thought

http://en.wikipedia.org/wiki/Color_blindness

Deuteranopia is a color vision deficiency in which the green retinal
photoreceptors are absent, moderately affecting red-green hue
discrimination. It is a form of dichromatism in which there are only
two cone pigments present. It is likewise hereditary, sex-linked, and
present in 1% of all males

Protanomaly is a mild color vision defect in which an altered spectral
sensitivity of red retinal receptors (closer to green receptor response)
results in poor red-green hue discrimination. It is hereditary, sex-linked,
and present in 1% of all males. It is often passed from mother to child

Deuteranomaly, caused by a similar shift in the green retinal receptors,
is by far the most common type of color vision deficiency, mildly affecting
red-green hue discrimination in 5% of all males. It is hereditary and sex-
linked


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