A Maths Dictionary for Kids - dictionary of math terms with visuals and activities link to the conceptGeogebra - Free mathematics software for learning and teaching interactive graphics, algebra and spreadsheet for K- college.Illuminations website - activities and lesson plans aligned to NCTM standards.Inside Mathematics - resources in each grade level organized by grade or by math concept. They include a math problem with a scoring rubric, sample student responses, teacher information and dialogue and teaching practices.Khan Academy - educational videos produced by Salman Khan available on YouTube, iTunes, and Khan Academy.org. They cover everything from basic addition lessons to lessons in trigonometry.UEN elementary/secondary math - resources / lesson plans
WolframAlpha - any mathematical computation or visual representation you need, you can find the answer here.
Body Browser a 360 degree view of the human body with views of bones, muscles, organs, and the nervous system.
Explore Learning: Online simulations (virtual manipulatives) for science (and math). Grades 3-12.
Mind Project- virtual science labs related to health and biology that are free for teachers and students to use. Very interactive and informative.
National Geographic for Kids: Animals - General resource on animals for students. Good for researching for information on animals.
The Physics Classroom- lessons, tutorials, practice problems, and interactive demonstrations.
Sick Science are short demonstrations of science experiments students and parents can do at home
Study Jams are videos, slide shows, and step by step explanations for science and math that will have your students discovering everything from invertebrates to the water cycle and the rule of divisibility.
The Virtual Cell Free interactive tour of a cell.
Virtual Chemical Lab-Choose solutions from the vast database and mix 'em together till the cloned cows come home. Marvel as the chemical solutions react in real time.
WICKED Science interactives help students understand the earth- what it looks like, what it is made of, and how it works.