Cells Continuously Eat and Regurgitate Tattoos

It’s widely understood that tattoos are permanent, but a recent study in the Journal of Experimental Medicine has found they are also ever-changing. French scientists have discovered that ink crystals are in fact “continuously engulfed, regurgitated and gobbled back up” by a body’s cells. These cells, known as macrophages, work as part of the immune system to swallow harmful, foreign junk. Read much more about these “microscopic Pac-Mans” at the New York Times.