Tattoos are forever, right? Well, maybe not like we once thought. You can get them removed (though laser tattoo removal is nothing to scoff at), get an ephemeral tattoo that fades in a few years, or ...

Add Yahoo as a preferred source to see more of our stories on Google. But he is now embarking on a quest to turn tattoos into medical diagnostic devices, using “Magic Ink” — a tattooing ink which can ...