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Hand any science teacher a parabolic mirror, and the first thing they want to do is start a fire. (Trust us. We’ve met thousands.) Get right to the point with this mirror, originally designed for the hikers and ­campers! It’s equipped with a prong that holds fuel right at the focal point. Held in bright sun, it generates smoke in seconds! But don’t stop with ordinary paper fuel. Try our favorite demo – the mini-marshmallow roast.