Richard Clark wrote:
Let's face it, you never really say anything in the end. We can see
this in the guff like that above. "nailed it down," now there's a
charming non-sequitur. Maxwell preceded him by decades with the
definition of the speed of light - Einstein certainly nailed nothing
there.

Einstein was the first to nail down the speed of light
in free space as an absolute in his relativity equations.
You can verify that fact by Googling "relativity".
--
73, Cecil http://www.w5dxp.com