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How do you make ice sink in water?

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Ice made with heavy-water will sink in normal water.
Heavy water is water made with Deuterium, a special type (isotope) of Hydrogen which has a nucleus containing 1 proton and 1 neutron (instead of just a single proton).
I think that drinking heavy water is bad (in excess of a certain amount) for you since it takes your body more energy to process it than it does normal water (differences in density, heat capacity, and what-not), so this really isn't much of a solution.