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Sniffing for a Billionth

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This is an activity (located on page 4 of the PDF under What's Nano? Activity) about size and scale.
$1 - $5 per group Ages 8 - 14 1 to 2 hours

Cookie Surface Area

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This is an activity (on page 2 of the PDF under Surface Area Activity) about surface area to volume ratio.
$10 - $20 per group Ages 8 - 14 30 to 45 minutes