Khan Academy
Khan Academy: Biology and the Scientific Method Review
Review your knowledge of the nature of science as it relates to biology.
PBS
Pbs Learning Media: Nova: Gross Science: Collection
Why do we smell different when we're sick? Why does cheese smell like feet? Why don't vultures get sick from eating rotting meat? Science is filled with stories: some of them are beautiful and some of them are gross. Really gross. Gross...
Indiana University
Indiana University: Ensi Sensi/nature of Modern Science
This paper by Martin Nickels includes a section titled "The Uncertainty & Limits of Scientific Knowledge."
Lawrence Berkeley National Laboratory
Berkeley Lab: "But What Is It Good For?"
Overview of the many applications of nuclear science that benefit a wide variety of disciplines.
PBS
Pbs Teachers: Scientific American: Science Italian Style: Where's the Matter?
Explore some of the hard questions and issues related to scientific research and project funding. Role-play a mock Congressional hearing to discuss the wisdom of a new scientific venture with no perceivable practical use to mankind.
Science Bob Pflugfelder
Science Bob: The Scientific Method
Gives an overview of the scientific method as it relates to a science fair project.
Other
Teaching Ideas for Primary Teachers: Science Ideas
A great resource to discover fun new activities to use in your classroom. Activities are age-appropriate, and span several science topics.