A Marvelous Thought-Provoker! -- Two seemingly identical black spheres, with marked differences in their physical properties. They have the same density, mass, color and appearance; yet when dropped to the floor, one jumps wildly, the other is motionless. -- Marvelous thought provoker for discrepant events science. Fact sheet on physical and chemical properties, plus experiments for classroom use included. -- Two sizes: 3/4" diameter or 1.5" diameter.

$4.95

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LEDHALOGEN COMBINATION RECHARGEABLE FLASHLIGHT

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