Ad: What Wavelength Are You On? Psyche Geek Humor Doormat
No need to be a physicist to understand atmospheric electromagnetic transmittance with a dose of wry geek humor on this psychological door mat featuring the common rhetorical question: "What Wavelength Are You On?" Memorable doormat for anyone who converses with other people and who finds that one is frequently having a different conversation that one had expected! myPhysics
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