This is an excellent site providing interactive text in a variety of subjects. I only checked out social studies, but there are various sections on math and science (some even in Spanish). Lessons are interactive and contain relevant images and great multimedia presentations. I highly recommend it.
Another cool thing about this site is that a teacher can set up an account and provide a custom HippoCampus page for his/her students. This can be helpful for all students, regardless of their abilities.
Reason Effectively
* Use various types of reasoning (inductive, deductive, etc.) as appropriate to the situation
Use Systems Thinking
* Analyze how parts of a whole interact with each other to produce overall outcomes in complex systems
Make Judgments and Decisions
* Effectively analyze and evaluate evidence, arguments, claims and beliefs
* Analyze and evaluate major alternative points of view
* Synthesize and make connections between information and arguments
* Interpret information and draw conclusions based on the best analysis
* Reflect critically on learning experiences and processes
Solve Problems
* Solve different kinds of non-familiar problems in both conventional and innovative ways
* Identify and ask significant questions that clarify various points of view and lead to better solutions