Cramster, a global math and science study community that launched in 2003, is a place where students can interact online with teachers and their peers to help solve problems based on subjects such as physics, calculus, and chemistry. The mostly-free online community features a number of study materials, such as textbook solutions and practice exams, as well as an interactive question-and-answer board that is monitored by Cramster "Subject Matter Experts." Students can post questions, and registered teachers post guidance in response. Earlier this year, Cramster launched a Facebook application called Courses 2.0, where Facebook members can find and communicate with one another on the Cramster web site outside of the classroom. Cramster is based in Pasadena, Calif.