Nature of Science
This is a concise description of what the nature of science is. More interestingly, it contains a link full of lesson plans all centered around teaching the nature of science.
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Ashley Davila (Student)
Although I have not used this with secondary students, I have used one of the lessons in my college class. The lesson was easy to follow and a good introduction to the nature of science. This website also has a good explanation of the nature of science that can be turned into a powerpoint to explain to students.
This website is used for the study of evolution. As an introduction it has an explanation of the nature of science. It also contains easy to follow lesson plans for grades K-12 in evolution and the nature of science.