Ad: What Wavelength Are You On? Psychology Humor Face Mask
No need to be a physicist to understand atmospheric electromagnetic transmittance with a dose of wry geek humor on this cotton/polyester face mask which features the common rhetorical question: "What Wavelength Are You On?" Memorable face mask for anyone who engages in conversations with others and who finds that one is frequently having a different conversation than one intended to have! myPhysics
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