"I got mine in grad school (PhD materials science and applied physics, 2004 Cal). The tatoo is a convergent beam electron diffraction (CBED) image of 6-4 Ti alloy (hexagonal, or beta phase) one of the first 'super alloys'. Being light-weight, high-strength, and corrosion resistant, I felt it was appropriate to put on my back, to keep it strong."--Abraham
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