Mice are a common laboratory animal for pre-human testing.  Everything from drugs to medical treatments to surgeries have been tested on mice, and the effects of spaceflight are no exception.  Animals such as Laika the dog and Rhesus monkey Albert 1 have had their own test flights, but mice offer an easy alternative when there’s not much extra room on a spacecraft. In a recent study, mice flown on the space shuttle Atlantis were shown to have developed early signs of liver disease.  Could humans in space exhibit the same symptoms? “Prior to this study we really didn’t have much information...