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See the full experiment here: http://www.stevespanglerscience.com/lab/experiments/thermite-reaction
A rusted iron ball bearing seems like it might be past its prime, as far as uses go. Thankfully, all you need to do is wrap one of the bearings in some aluminum foil. You’re almost ready to create a thermite reaction. BANG!
Want more experiments like this? Check out http://www.stevespanglerscience.com/product/naked-eggs-and-flying-potatoes
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