NSTA.org posts a free article from each of their journals every month. This month you can get:

CSI for Trees from Science & Children (Elementary)

No More Leaks from Science Scope (Middle School)

Using Issues-Based Science in the Classroom from The Science Teacher (High School)

I highly recommend joining NSTA (lots of great resources)- you receive one of the journals with your membership and you also get electronic access to all of the journals.

You can also download a free chapter from Inquiry: The Key to Exemplary Science- Click HERE.

Applications for Science Teachers: Regardless of your grade level and membership status you will find many practical resources to support your science teaching.