For the past three years, the National Center for Learning and Teaching in Nanoscale Science and Engineering (NCLT) has held professional development programs on nanoscale science and engineering across the nation, and we will be running the program again in the summer of 2009. The program offers science teachers opportunities to work with nanoscale science and engineering researchers, science and engineering educators, and learning tool experts in content understanding, curriculum development, and hands-on laboratory experiments with nanoscale phenomena.