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Fun, interactive, research-based simulations of physical phenomena for free

"SweetSearch is a Search Engine for Students. It searches only the 35,000 Web sites that our staff of research experts and librarians and teachers have evaluated and approved."

Pre-Grade Your Paper: Free Online Grammar Checker, Proofreader, and More "PaperRater.com is a free resource, developed and maintained by linguistics professionals and graduate students. PaperRater.com is used by schools and universities in over 46 countries to help students improve their writing. PaperRater.com combines the power of natural language processing (NLP), artificial intelligence (AI), machine learning, information retrieval (IR), computational linguistics, data mining, and advanced pattern matching (APM). We offer the most powerful writing tool available on the internet today."

"This site was created to serve as a collaborative, objective resource for educators and administrators who are committed to enhancing student achievement. We invite you to share your knowledge, ask questions, and get expert insight into the issues teachers face each day in the classroom."