Disney's family fun has instructions for how to pick up an ice cube with a string demonstrating the effect of salt on ice. All you need is a glass of water, an ice cube, salt and string.
Good for ages 4 and up.
Get the instructions here:
http://familyfun.go.com/crafts/crafts-by-type/educational-craft-activities/science-projects/life-an-ice-cube-with-string-829549/
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