These are some educational java applets to help visualize various concepts in math, physics, and engineering. You should be able to view them with any Java-capable browser.
LearnersTV offers free online interactive science animations on subjects like Biology, Physics and Chemistry. These Animations will help you visualize and understand difficult concepts. Following is the current list of online science animations available as on Tuesday, May 29, 2012. More animations will be uploaded shortly!!!
How to Smile is an online community of educators that have vetted over 3,000 engaging hands-on, interactive STEM activities. With both desktop and mobile capabilities, How to Smile is full of activities that are both physical and virtual that are sure to get students involved. Tip: Use How to Smile's search by chemical directory to find activities for any type of experiment.
This site has TONS to do and teaches about diseases, nutrition, physical activity, safety (on and off line), being smart consumers (like how to read through to the message in advertising, and body image) There is a great teacher integration corner, printables galore...