Art Unwin wrote:

...
That was ruled out when it was determined that Neutrons were not
without mass !

Hmmm ... actually, how can anything "really" be without "mass", isn't
energy just a "form of mass" and "vice versa?" I mean, the equations
certainly imply this ...

I mean really, when we deal with particles the size of photons and below
.... aren't they "melding" into the same "thingys" grin ... and,
perhaps my data is old ... I don't think "newton does quantum", but he
might have a brother by the same name ... ;-)

Regards,
JS