Not very clever Einsteinians believe that the Michelson-Morley
experiment CONFIRMED Einstein's false principle of constancy of the
speed of light and teach accordingly:

http://physics.suite101.com/article.cfm/einsteins_special_relativity
Paul A. Heckert: I am a university professor who has been teaching
physics and astronomy for over 25 years. I have a Ph.D. in
astrophysics and specialize in observational astronomy. My work has
led to numerous published research articles in various astronomical
journals: "Rather than trying to understand why the Michelson-Morley
experiment didn't work, Einstein assumed that it did work and asked
what the unexpected result was telling us about nature. Einstein took
the result as his starting point. He made the basic assumption that
the speed of light is a fundamental constant in the universe and that
all observers in any reference frame that is not accelerating will
measure the same value for the speed of light. His assumption that any
observer moving at any constant velocity will measure the same value
for the speed of light led to special relativity. Basically if the
speed of light can't change for different observers moving at
different speeds, some other things, such as length and time, must
change. Einstein found a number of surprising consequences to this
assumption."

http://www.hawking.org.uk/lectures/dice.htmlStephen Hawking: "Both
Mitchell and Laplace thought of light as consisting of particles,
rather like cannon balls, that could be slowed down by gravity, and
made to fall back on the star. But a famous experiment, carried out by
two Americans, Michelson and Morley in 1887, SHOWED THAT LIGHT ALWAYS
TRAVELLED AT A SPEED OF ONE HUNDRED AND EIGHTY SIX THOUSAND MILES A
SECOND, no matter where it came from."

Clever Einsteinians know the Michelson-Morley experiment REFUTED
Einstein's false principle of constancy of the speed of light and
teach accordingly:

archive.pitt.edu/archive/00001743/02/Norton.pdf John Norton: "Einstein
regarded the Michelson-Morley experiment as evidence for the principle
of relativity, whereas later writers almost universally use it as
support for the light postulate of special relativity......THE
MICHELSON-MORLEY EXPERIMENT IS FULLY COMPATIBLE WITH AN EMISSION
THEORY OF LIGHT THAT CONTRADICTS THE LIGHT POSTULATE."

For the last 100 years physicists have been constantly exposed to both
teachings.

Pentcho Valev