This article discusses the open-content movement in education. A small but growing movement of K-12 educators is latching on to educational resources that are "open," or free for others to use, change, and republish on web sites that promote sharing. The open-content movement is fueled partly by digital creation tools that make it easy to create "mash-ups," or digital medleys of content of various types. Educators and education-oriented groups advocating open content say it saves schools money by spreading the time and expense of developing curricular resources over many contributors. It also passes on the value that teachers add, when they adapt works originated by others, so other educators can benefit from it.