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In this math activity, learners use cubes to calculate how many blocks it would take to build stairways with different heights.

1 cent - $1 per student Ages 8 - 11 10 to 30 minutes
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Learners match puzzle pieces to outlines of a DNA strand. The puzzle pieces represent the four chemicals making up DNA base pairs: adenine, thymine, guanine, and cytosine.

$5 - $10 per group Ages 8 - 18 5 to 10 minutes