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In this classic hands-on activity, learners estimate the length of a molecule by floating a fatty acid (oleic acid) on water.

$1 - $5 per student Ages 11 - 18 45 to 60 minutes
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Learners investigate why the Sun and Moon appear the same size in the sky even though the Sun is over 400 times larger in diameter.

1 cent - $1 per group Ages 8 - 11 10 to 30 minutes
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In this activity, learners explore how distance can affect the way we perceive the size of an object.

free Ages 4 - 18 5 to 10 minutes