| The Keck Interferometer is a NASA-funded project to join the two 10-meter Keck telescopes. The first observing mode, visibility amplitude, is now operational and is open to proposals from the Keck community. I will briefly describe the operation of KI and then present the science results from the first few years of observations. These results include using the interferometer to constrain the inner regions of circumstellar disks around young stars and probing the centers of active galactic nuclei. |