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Vicki Davis 08 Feb 12 11:51:18 I know Steve Spangler sells a lot of science things on his website, but I just enjoy him. I like how he explains things and how he uses colorful, attractive things in his science experiments. If you're a science teacher, I think you'll enjoy browsing the experiments on his website. Here is one on convection currents. He shares how to do all of the experiments, so you don't have to buy anything from him. This is a great example of how you can be helpful and people want to buy from you.