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On this forum you can obtain answers to questions about science. All levels from kindergarten to postgraduate level are covered. This site contains a large archive of previously answered questions. You can also pose new questions to their volunteer panel of nearly 800 experts around the world.
This website from the National Institute of Environmental Health Sciences (NIEHS) provides educators, students and scientists with easy access to reliable tools, resources and classroom materials, curricula, and easy access to reference materials.
Prof. T. Ross Kelly a professor of chemistry at Boston College has accumulated a collection of various gizmos, devices, and toys which are excellent examples of scientific principles or things that you look at and you say "That's impossible!" except it's staring you in the face. This collection of videos include explanations of how they work or references to where one can find this information.