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    The Exploratorium
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    In this activity, learners can create five-layer density columns by employing one of three (or all) methods. Method 1 gives the names of the liquids and the order for adding them, and its goal is...

    $5 - $10 per group Ages 11 - 18 45 to 60 minutes
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    Pratt School of Engineering, Duke University
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    Learners initially test to see how many drops of liquid (water, rubbing alcohol, and vegetable oil) can fit on a penny. They then generate their own hypotheses to explain the results and design...

    $1 - $5 per group Ages 11 - 14 10 to 30 minutes
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    New Jersey Department of Education
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    Learners explore water's property of cohesion through two investigations. In Drops on a Penny, they see how many drops of water or other fluids can fit on a penny before the drops run over,...

    $1 - $5 per group Ages 8 - 14 1 to 2 hours
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    Mount Holyoke College
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    In this experiment, learners separate different types of molecules in marker inks (using a technique called "thin layer chromatography"). Learners mark dots at the bottom of a strip of...

    $1 - $5 per student Ages 4 - 8 30 to 45 minutes
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    NISE Network
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    In this activity, learners explore how nanosized structures can create brilliant color. Learners examine Blue Morpho butterflies in the light and discover what happens when they put a drop of...

    Over $20 per group Ages 6 - adult 10 to 30 minutes
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    Community Science Workshop Network
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    In this activity, learners extract DNA from a strawberry and discover that DNA is in the food they eat. Learners use simple materials to break open the cells of a strawberry and see DNA with their...

    $1 - $5 per student Ages 11 - 14 45 to 60 minutes
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    American Chemical Society
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    In this activity on page 4 of the PDF, learners conduct some quick and easy tests to determine the differences between water and other liquids that look very similar to water. Learners compare how...

    $1 - $5 per student Ages 6 - 14 10 to 30 minutes
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    The Exploratorium
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    In this activity, learners separate the components of Gatorade using a home-made affinity column. In doing so, learners model the basic principle of affinity chromatography, a technique used to...

    $10 - $20 per student Ages 11 - 18 45 to 60 minutes
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    Integrated Teaching and Learning Program, College of Engineering, University of Colorado at Boulder
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    Learners conduct two activities to investigate two properties of liquids: density and viscosity. In a clear container, learners stack 7 different liquids which will layer according to their density...

    $5 - $10 per group Ages 11 - 14 30 to 45 minutes
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    Make
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    Agriculturalists have long considered mushroom growing a challenge, largely because you need a piece of benchtop equipment known as a laminar flow hood. In this activity, learners make their own ...

    Over $20 per group Ages 11 - adult 1 to 4 weeks

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