Science and Innovation
Energy.gov, the website for the U.S. Department of Energy, contains multiple layers of educational material for students and teachers. Their science and innovation section provides links to articles and videos on physics, biology, chemistry and environmental science. These resources could prove useful for high school and college level instruction.
Next you'll find the science education section which when you first view it seem rather plain. There are a number of videos but looking deeper you'll find the Energy Kids area which is full of energy-related kid's resources including games, riddles, field trips, and classroom activities. The site also contains a teacher's guide with lessons for students of all ages.
___________________________________________Energy Star Kids
Finally there is the Energy Star Kids section which explores energy conservation and is targeted for elementary level learners. This page does include information, games and a parent/teacher area with lesson plans.
The Library of Congress website has a very cool science area called Everyday Mysteries where students explore science based questions and mysteries. There dozens of "mysteries" for students to examine from ten science based categories. Each "mystery" comes with a detailed explanation and pictures to help the student learn more about the topic. There are also additional resources given for those who are doing a research project.