Billy Hudson, a mathematician, writes, “I was in a introductory Number Theory class when Professor David Ferguson told me that e^(ipi) + 1 = 0. Of course, Euler’s equation had the same affect on me as it has on many undergraduate mathematicians, i.e. I was hooked. I had the equation tattooed on my arm in May of 1998, thinking that if nothing else it would be unique. I’ve still yet to meet anyone else with the tattoo, but as your site shows, there are others (although I still think I may have been the first :).”

You can see the rest of the Science Tattoo Emporium here or in my book, *Science Ink: Tattoos of the Science Obsessed.*