On May 8, 2:21 pm, liketofindoutwhy
wrote:
I once heard that everything is relative, except the speed of light,
which is absolute...

is that true really? if living things cannot see, and therefore not
be able to see light, then maybe we will think everything is relative,
as we don't know light exists.
Well, we could have developed electroreception just like sharks and
some moles. Then we would be measuring things like dielectric constant
and magnetic permeability constant. Eventually, we would get to
measuring dielectric constant and magnetic permeability in a vacuum.
We would be measuring electromotive force, too.
Eventually, I think we would work our way up to Maxwell's
equations even without light per se. Remember, Maxwell did not derive
his equations based on light, it just happened to describe light.
We would get to special relativity anyway via electroreception,
with no eyesight. That is my opinion.