This is a fascinating coverage of the history of the Gravity Probe B and also the tenacity of its champion, Stanford physicist Francis Everitt, in keeping it alive and running.
I continue to be amazed at something like this. You have a science experiment that is trying to test one of the most fundamental and important aspect of our universe, and it struggles to continue to exist while operating under such puny budget when compared to the cost of other things (I believe you can come up with your own list of what these "other things" are). So you force the researcher to go begging for money just to continue with the original mission. This partial funding of something and cutting it of before it completes its mission is INSANE!