1. Carnegie Mellon University Center for Computational Thinking; http://www.cs.cmu.edu/~CompThink. Carnegie Mellon University Center for Computational Thinking; http://www.cs.cmu.edu/~CompThink.
2. Computer Science Unplugged Web site; http://csunplugged.org. Computer Science Unplugged Web site; http://csunplugged.org.
3. Computing is a natural science
4. Great principles of computing
5. Is computer science science?