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Crack Balls

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It’s fireworks time! Skylighter.com has a recipe for a more powerful version of those balls that bang when you knock them together. You paint smooth rocks with a mixture that contains powdered glass, potassium chlorate, and sulfur (all disclaimers in place). Then let dry. Drop or throw the rocks, and they’ll “bounce” repeatedly with a loud explosion each time.
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Paul Spinrad is a broad-spectrum enthusiast, writer, maker, and dad who lives in San Francisco. He hatches schemes at http://investian.com.

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