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"Teachers' Domain is a free digital media service for educational use from public broadcasting and its partners. You’ll find thousands of media resources, support materials, and tools for classroom lessons, individualized learning programs, and teacher professional learning communities." Free registration for teachers and students 13 or older.
BioEd Online Developed by Baylor College of Medicine. Teacher resources for biology educators with an emphasis on medical applications. Includes a PowerPoint slide library, stream video presentations and news. Practical Biology "Practical Biology provides teachers of biology at all levels with experiments that demonstrate a wide range of biological concepts and processes."
The Concord Consortium a non profit educational research and development organisation based in Concord Massachusetts bringing the promise of technology into reality for education in science, math and engineering