On Sat, 04 Jun 2011 12:54:18 -0700, the following appeared
in sci.skeptic, posted by John Smith :

On 6/4/2011 11:40 AM, Bob Casanova wrote:

EM radiation doesn't require a propagation medium.

This argument can be dismissed immediately,

It's not an "argument"; it's an observation.

HTH.

light are EM radiation are
both governed by the same laws and physics, are are the same phenomenon,
of differing frequencies.

Yes. So? Do you imagine light can't propagate through a
vacuum?
--

Bob C.

"Evidence confirming an observation is
evidence that the observation is wrong."
- McNameless