Second Life is a virtual world with tens of millions of square meters of virtual lands, more than 13 million "residents," and a thriving economy. The ease in which users can build and modify virtual spaces has made it an attractive choice for experiments in learning space design and educational experiences such as virtual field trips or the creation of galleries to display student-created media. The 7 Things You Should Know About Second Life, EDUCAUSE Learning Initiative’s (ELI) latest brief in the monthly series, examines how Second Life lets educators easily build and modify learning spaces to test how different strategies for a physical space affect learning and how a similar approach can be taken toward educational activities in those spaces.