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Kitchen chemistry: Just add water and light a science spark

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FARGO, N.D. — Start with water. Add a healthy splash of cooking oil, and just a few drops of food coloring.

It might sound like a bad recipe, but in the hands of Graeme Wyllie — and the addition of half a tablet of Alka-Seltzer — the four ingredients combine into an impressive, if only temporary, homemade lava lamp.

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