"It provides daily news stories, with the same one edited several times for different reading levels. The stories also have self-scoring quizzes and provide decent “critical thinking” questions that students can respond to in the comments. On top of that, teachers can create virtual classrooms to monitor it all, as well as moderating student comments."
"The History Engine is an educational tool that gives students the opportunity to learn history by doing the work—researching, writing, and publishing—of a historian. The result is an ever-growing collection of historical articles or "episodes" that paints a wide-ranging portrait of life in the United States throughout its history and that is available to scholars, teachers, and the general public in our online database."
"In "Construct an Aqueduct," you are hired as Chief Water Engineer by the Roman Emperor. Your job: to build an aqueduct that will supply the Roman city of Aqueductis with clean water to private homes, public baths and glorious fountains. Succeed, and citizens of Aqueductis will drink clean water and bathe happily. Fail, and there's no telling what your countrymen will do."
"Quality search tool with curated resources and links to credible sites."
"Browse thousands of K-12 collections made by teachers or search over 16M resources. Remix collections and customize content to meet your students' needs. Share collections with students via My Classes. Login is not required to access. Measure your students' engagement and progress to intervene in real-time."
"The Powder Toy is a free physics sandbox game, which simulates air pressure and velocity, heat, gravity and a countless number of interactions between different substances! The game provides you with various building materials, liquids, gases and electronic components which can be used to construct complex machines, guns, bombs, realistic terrains and almost anything else. You can then mine them and watch cool explosions, add intricate wirings, play with little stickmen or operate your machine. You can browse and play thousands of different saves made by the community or upload your own – we welcome your creations!"