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Doctors often send a sample of blood to a lab, to make sure their patients are healthy.

$5 - $10 per group Ages 8 - adult 5 to 10 minutes
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In this activity on page 9 of the PDF, learners test how flavoring extracts move through the walls of a balloon.

$5 - $10 per student Ages 8 - 14 10 to 30 minutes