Aspirin can cure a headache, but when you pop an aspirin tablet, how does the aspirin know

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Aspirin can cure a headache, but when you pop an aspirin tablet, how does the aspirin know to go to your head rather than to your big toe?

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Conceptual Integrated Science

ISBN: 9780321818508

2nd Edition

Authors: Paul G Hewitt, Suzanne A Lyons

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