> You may think that heat, cold, and pain are all
> components of touch, but they are not. Touch
> tells you whether something is wet or dry,
> slimy or sticky, rough or smooth. But there are
> actually special nerves in your skin that
> detect heat, the lack of heat (cold), and, my
> favorite, pain.

We have different types of receptors for color vision and for black-and-white vision, but we still consider that one sense. I don't see why we should separate heat, cold (aren't those the same receptors), pain, pressure, and being-able-to-tell-if-something's-sticky into separate senses. They're all just specialized factors of touch.

-Eric Sleator
Tue 22 Oct A.D. 2002