MarkWhittington writes "NASA engineers at the Marshall Spaceflight Center in Huntsville, Ala., are building a mockup of what appears to be a deep space habitat, though it could also be part of an interplanetary spacecraft. The purpose is to do human factors studies to find out how to sustain astronauts on lengthy deep space missions." Link to Original Source
If it happens once, it's a bug. If it happens twice, it's a feature.
If it happens more than twice, it's a design philosophy.