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We have also compiled a collection of papers on space microbiology in an online resource to provide a more comprehensive historical perspective of this kind of work (see http://www.mendeley.com/groups/844031/microbiology-of-the-built-environment/papers/added/0/tag/space/).   The microbial census of ISS surfaces presented here is a component of a larger project (Project MERCCURI) which was undertaken for both scientific reasons as well as for its outreach and education potential. Project MERCCURI (Microbial Ecology Research Combining Citizen and University Researchers on the ISS) is a collaborative effort of UC Davis (microBEnet), Science Cheerleader, NanoRacks, Space Florida, and Scistarter.com. Other parts of the project involve growing cultured microbes on the ISS and a large-scale cell phone and shoe microbial  biogeography study, but here we focus on a microbial survey of surfaces onboard the ISS. The 15 surfaces sampled on the ISS were chosen by the Project MERCCURI team in an effort to make them analogous to 1) the surfaces sampled for the "Wildlife of Our Homes" project, which asked citizen scientists to swab nine surfaces in their homes , and 2) other samples that were being collected via Project MERCCURI. The motivation for choosing the sites in this way was both to increase public engagement with the data, as well as to begin to compare the microbial ecology of our homes on Earth with our only home in space. We also present a comparison to another relevant citizen science project, Belly Button Biodiversity. data from 13 body sites sampled via the Human Microbiome Project.  This project was selected to represent the potential human contribution to the microbial life on the ISS.