Parts of special relativity have been proven in the past. Probably most known one was the part of the theory that suggested that gravity would affect light waves. This has been observed during total eclipses where starlight would get warped by the sun on it's way to Earth -- otherwise known as a "gravitational lense."
Aren't all electromagnetic waves affected by gravity? Visible light is only one narrow part of the EMF spectrum.
It had been holding true for larger cases but like most all things we consider "laws" in physics (such as newtons 2nd law F=ma) tend to fail as one of two things happens... 1) you get really really small 2) you go really really fast... fast as in approaching the speed of light It's truely amazing the ole albert came up with this therory and its still olding true in most all cases even at sub atomic levels. and when he came up with this we hardly new anything about sub atomic particals. Kudos on a good article find