“This neuron tattoo was done a few months ago. When I was 18, my dad passed away from Lou Gehrig’s, which is a disease of motor neurons that innervate muscles. His battle with neurodegeneration helped me decide on a career in medical research, and I am currently pursuing my PhD in Neuroscience.”–Lindsay

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Originally published February 17, 2008. Copyright 2008 Carl Zimmer.

“I was hoping you could put this tattoo up as your flicker page is missing any tattoo’s of electrical engineering.

This tattoo is the schematic for the reference point of electricity. I just think of it as the source of electricity. Its really either the point at which you consider voltage to be 0, or in this pictures case, the physical connection to the earth (hence the lower calf). Electronics has been my passion for as long as I can remember, and I feel like this tattoo doesn’t do it justice. So I plan on getting another one to incorporate my passion for electronics and my trans-humanism beliefs.”

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