Einstein's relativity started with the rejection of Newton's thesis
that the speed of light varies exactly as the speed of cannonballs
does:

http://www.amazon.com/Relativity-Its.../dp/0486406768
"Relativity and Its Roots" By Banesh Hoffmann
"Moreover, if light consists of particles, as Einstein had suggested
in his paper submitted just thirteen weeks before this one, the second
principle seems absurd: A stone thrown from a speeding train can do
far more damage than one thrown from a train at rest; the speed of the
particle is not independent of the motion of the object emitting it.
And if we take light to consist of particles and assume that these
particles obey Newton's laws, they will conform to Newtonian
relativity and thus automatically account for the null result of the
Michelson-Morley experiment without recourse to contracting lengths,
local time, or Lorentz transformations. Yet, as we have seen, Einstein
resisted the temptation to account for the null result in terms of
particles of light and simple, familiar Newtonian ideas, and
introduced as his second postulate something that was more or less
obvious when thought of in terms of waves in an ether."

Recently the journal Nature vindicated Newton's thesis and so
implicitly rejected Einstein's relativity:

http://www.nature.com/news/2010/1006....2010.303.html
NATU "Gravity is mercilessly impartial - on Earth, it accelerates
light and heavy objects alike with a tug of 9.8 metres per second
squared."

(Don't be misled by the lie that immediately follows: "That property
is the cornerstone of Albert Einstein's theory of general
relativity...")

Of all the Einsteinians not one could think of a reason why Nature's
assertion should be discussed. The rest of the world couldn't care
less about any analogy between light and cannonballs.

Pentcho Valev