> Indeed, but it was intended to be a crude analogy that should still work if
> the original idea is true. Try superman swimming through magma if you like,
> it doesn't really matter, it's the principle that that counts. Every action
> produces an opposite and equal reaction, surely the movement of the material
> will always be towards equillibrium.
>
Exactly. In the case of swimming superman (also when I swim, by
the way, even though I'm not superman :-) this relaxation towards
equilibrium has a useful by-effect - Superman moves up a few inches.
This is exactly what the swimming movements are `designed'
to do.
Mark
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