Re: recoiling photons evidence?

Ralph Sansbury replied to Craig Markwardt:
 
>    But there are no physically massless particles because it is
> impossible to measure zero mass. Therefore you can only DEFINE the
> photon as massless... There is no independent rationale for this.
 
There are no physically giraffeless particles because it is
impossible to measure zero giraffes.  Therefore you can only
DEFINE the photon as giraffeless.  There is no independent
rationale for this.
 
Measurements show that photons have less than 0.1 nanogiraffe,
but it wouldn't make sense to say that photons therefore have
no giraffes at all.
 
  -- Jeff, in Minneapolis
 
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