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In this activity, learners will reuse plastic bags in an interesting way.

free Ages 6 - adult 45 to 60 minutes
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In this activity (on page 2 of the PDF), learners make a plastic protein polymer from milk. Adding vinegar to milk causes the protein casein to solidify or curdle.

$1 - $5 per student Ages 6 - 14 1 to 7 days