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Bubble Trouble

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In this activity on page 15 of the PDF, learners measure the amount of bubbles that they make using a detergent.
$1 - $5 per student Ages 8 - 14 30 to 45 minutes

Secret Goldenrod Messages

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In this activity, learners write invisible messages on goldenrod paper, and make the message appear and disappear using acids and bases.
1 cent - $1 per student Ages 6 - 14 30 to 45 minutes