[litespeed (OP)]

The Michelson-Morley experiments showed light speed is the same for all observers. What other explanations could there have been other then, at least,time dialation?

[PhysBang]

One can account for the M-M experiment with a real contraction of physical objects in space. However, one cannot account for the constancy of the speed of light (and for identical laws for electromagnetic phenomena) in all inertial reference frames without contraction, time dilation, and the relativity of simultaneity.

[butchmurray]

He did mention it.

“Relativity The Special and General Theory” by Albert Einstein is great. Translated by Robert Lawson. It the 1920 translation. It’s a free book online.

XVI.  Experience and the Special Theory of Relativity

http://www.bartleby.com/173/16.html

[yor_on]

Yeah, it is a nice one

[Pmb]

The Michelson-Morley experiments showed light speed is the same for all observers. What other explanations could there have been other then, at least,time dialation?

He did mention it in his Nobel Speach as I recall. There's a nice article in the Am. J. Phy.