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    The Exploratorium
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    This activity about density provides instructions for making a miniature "lava lite" with just salt, oil, water, and food coloring. This crowd-pleasing experiment is a hands-on and...

    1 cent - $1 per student Ages 4 - 8 10 to 30 minutes
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    The Exploratorium
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    Build a hydrometer (measures the density of a liquid) using a pipet or eyedropper.

    1 cent - $1 per student Ages 8 - 18 5 to 10 minutes
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    The Exploratorium
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    Making liquids of different densities to perfectly lay on top of each other can be a frustrating exercise. The Exploratorium created this activity as a fool proof way of making a density column.

    1 cent - $1 per student Ages 6 - 18 5 to 10 minutes
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    The Exploratorium
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    In this science trick, learners get an egg to stand-up on its long-axis vertical to a table's top. Learners use salt grains, which are virtually unnoticeable to viewers, to give an egg's...

    1 cent - $1 per student Ages 8 - 18 5 to 10 minutes
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    The Exploratorium
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    In this activity, learners light an LED with five cents. Learners use two different metals and some sour, salty water to create a cheap battery. Learners also have the option of checking the...

    1 cent - $1 per student Ages 8 - 18 10 to 30 minutes