This episode of NOVA scienceNOW takes a close look at one of NASA's most complex missions: to repair the Hubble telescope; introduces Henry Molaison, whose brain is helping to create the most detailed map of memory yet; investigates earthquakes that struck North America not in California, but in the heart of the country; and profiles Alfredo QuiÁ±ones-Hinojosa, assistant professor of neurosurgery and oncology at Johns Hopkins University.