Gravity Probe B is due to be launched on Monday, 19 April, 2004. Many years in development, it is intended to provide good tests of "two extraordinary, unverified predictions of Albert Einstein's general theory of relativity." Many posters to PF have difficulties with GR; several have proposed alternative theories. Now is your chance to make history! What do you predict the results of Gravity Probe B will be? How do your predictions differ from those of GR?