Tattoo You: Immune System Cells Help Keep Ink In Its Place

Last Saturday, while I was visiting Fatty's Tattoos and Piercings, a college-aged woman in a hoodie walked in and asked for a tattoo, her first, right on the spot. "I want a red-tailed hawk feather," she told the artist on duty at the Washington, D.C., tattoo parlor. He peppered her with questions: How big?