Check out the following freebies for science teachers.
Earth Exploration Toolbook. This collection of activities teaches high school and college learners how to work with and interpret environmental science data sets.
National Nuclear Science Week Resources. This website contains resources and lesson plans to help middle and high school educators address nuclear science concepts in the classroom.
Alliance for Climate Education's High School Resources. Here you will find climate education resources for high school students and teachers, including lesson plans, environmental club project ideas, and climate information links for educators.
Encyclopedia of Life. This is a great source of online biodiversity resources for high school and college educators. It includes interactive tools that allow users to gather, customize, and save content.
Schools of Thought Blog. This new blog from CNN covers umbrella issues in education such as student, teacher, and parent accountability; bullying; and current education topics in the news.
Edheads Game Website. This site features educational games focused on science, math, and critical thinking.
Biology Lectures and Short Talks. Here you can find full-length video lectures on various biological concepts that move from broad introductions and progress to research questions and experiments.
NBC Learn. Produced by NSF and NBC Learn, these multimedia learning series for middle and high school levels feature videos, documents, images, and lesson plans.
If you have additional resources, please add them to this post!