Science tattoo idea. I'd probably go with acytlcholine... You know, being a teacher and all...
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Serotonin Molecule Tattoo, flower tattoo, happiness tattoo...
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White ink molecule tattoo by Jon Boy
A classic pairing of serotonin and dopamine
Seretonin and Dopamine is what I'd do, but on my feet, or somewhere else I could hide it :)
adrenaline molecule tattoo - Google Search
This would be great to stitch on a gift for a Starbucks-addicted math or science teacher. Caffeine Molecule design (UT3492) from UrbanThreads.com