This professional development site was created by the National Science Teachers Association. Contains several different sections of interest to teachers - Be sure to check out the FREE Science Objects (one- to two-hour interactive simulation-based learning experiences) The science objects were created for teachers, both new and experienced, who need a "content refresher". The Objects include multimedia content and include interactive simulations, audio, questions, student misconceptions to watch for and ideas for addressing these misconceptions. A great resource for improving your science instruction. - NSTA Journal articles (many free and containing high-quality lesson plans) - e-chapters from selected books and series (many FREE of charge) - FREE weekly live Web Seminars where you can interact with experts from NASA, NOAA, FDA, NSF, and the NSDL Community - SciGuides (resources to help teachers use the internet effectively in the classroom).