OpenSciEd, an effort led by 10 partner states, science educators, curriculum developers, and philanthropic organizations to improve the supply of and demand for high-quality K12 science materials, announced the public release of its freely available middle school science program. The three years of classroom materials are comprised of 18 units of instruction and have been externally evaluated by NextGenScience at WestEd and are listed as examples of quality materials on www.nextgenscience.org.