Gravity Probe B
There was a fascinating news briefing on NASA TV this morning by the people behind the Gravity Probe B . It was interesting to see them explain the technology that was required to make this satellite, especially the gyros that are incredibly accurate. Also they explained that the experiment is actually looking for an error in Einstein's general theory of relativity. If they repeat it I recommend you guys who have access to NASA TV give it a watch. Hopefully there is a site somewhere that will show that briefing.