I was very pleased to run across this little educational site from a large corporation that my husband used to work for. Seed has great experiment ideas and some really nice little animations on earth science, space, energy, health and even math puzzles. Look under the Science tab at the top to find the content. They have a store where they sell science kits and they even provide some online courses for some of the electronics kits they sell. There is also a lot of free information. Good for Elementary and Middle schoolers and free.