[Excuse_My_Bellicosity]

I was thinking the same thing. When I was in college, I remember a lecture in my junior-level physics class where the professor was saying that there is a ton of experimental evidence to show that Einstein's Theory of Relativity is true. One example he gave involved the GPS satellites. Every GPS satellite in earth orbit has an atomic clock onboard. The clocks have to compensate for relativity effects because they are orbiting at 18,000 mph relative to us. This disparity in time can be easily measured by atomic clocks, and it coincides precisely with known mathematical theory.

General relativity in the global positioning system.

[Batrachian]

Right, but someone else said that this more recent experiment explains a slightly different aspect of relativity. I don't quite remember the details.