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    Lawrence Hall of Science
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    Using a milk-based recipe, learners create "moo glue" which is basically white school-type glue. The "secret ingredient" in milk that helps make glue is a chemical called casein...

    $1 - $5 per group Ages 6 - 14 30 to 45 minutes
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    WGBH
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    In this activity, learners create and reveal secret messages written with invisible ink! The invisible ink is actually a baking soda solution, and the magical revealing liquid is fruit juice. The...

    $1 - $5 per group Ages 6 - 11 45 to 60 minutes