Prepare a \\\"magic elixer\\\" which has nearly the same index of refraction as pyrex test tube. Pour the solution into a beaker and place one or two pyrex test tubes in it. The test tubes are \\\"invisible\\\" from a distance. One might tell the class that the liquid has a memory. That is, if a test tube is broken and the pieces placed in the liquid, the atoms will separate and within seconds re-arrange themselves and reform the test tube!




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