Discover's Carl Zimmer seems to have realized that his biggest impact in 2+ years of blogging is the Emporium of Science Tattoos. He's put a link to the Emporium on his homepage. The tats are interesting because they show the human side of science workers, the love and devotion they have for their trade. A labmate of mine has a science tat on each ankle, one a little frog and another a DNA double-helix. Personally, I like this anglerfish. What's your favorite science tat?