The National Science Foundation (NSF) has crafted this well-curated collection of resources generated through NSF-funded educational research and development projects. The topical areas here include Teacher Development, Instructional Materials, Assessment, and Research Syntheses. Educators can navigate to the Resources area to explore over three dozen items, including the online book Worms, Shadows, and Whirlpools that was designed to help young children learn about science. Teacher Development includes thoughtful research materials, such as "Connecting with Mathematics: Ideas Behind Techniques" and the University of California Museum of Paleontology's "Understanding Science" site. Visitors can search the entire contents of the site at their leisure and they can also provide feedback via an online form.