The constancy of the speed of light postulated by Albert Einstein in 1905 was motivated by the null result of the Michelson-Morley experiment.
This is wrong. See
- http://en.wikipedia.org/wiki/Michelson%E2%80%93Morley_experiment#Fallout
- http://en.wikipedia.org/wiki/Michelson%E2%80%93Morley_experiment#cite_note-34
Einstein was mainly motivated by the results of FizeausFizeau's experiment measuring the speed of light in moving water