This is neat.
We are now performing experiments to test the theories of gravity (general relativity) and quantum mechanics that are approaching 100 years old.
We are now taking data in what have been classic "thought experiments". Gravity Probe B has gyroscopes containing the most perfect spheres ever made.
I have a similar type of gyro (in my "junk box") I use to show how different gyros are made and work. The sphere in mine is made of beryllium as apposed to quartz that was used on the Gravity Probe B.
We were able to test general relativity in the laboratory shortly after the Mossbauer Effect was discovered.