If humans are ever going to expand into space itself, it will have to be for a reason. Optimists think that reason is simply due to our love of exploration itself. But in history, it is more often a profit motive that has led humans to seek out new lands. So, it stands to reason that, in order for us to truly begin space colonization, we will have to have a business-related reason to do so. A new paper from the lab of Srivatsan Raman at the University of Wisconsin-Madison and recently published in PLOS Biology, describes one potential such business case - genetically modifying bacteriophages to attack antibiotic resistant bacteria.