Mad scientist kind of moments happen fairly often for nanoengineer Carson Bruns. A few months ago in his lab at the University of Colorado Boulder, he tested his latest invention on his own arm and ...

Rachel Feltman: Nearly a third of U.S. adults have tattoos, so plenty of you listeners can probably rattle off the basic guidelines of tattoo safety: Make sure you go to a reputable tattoo artist who ...

Problems? There are rashes — itchy, sometimes painful and occasionally disfiguring — which can assume fantastical shapes. Ink reactions also include pseudolymphomas — benign swellings around lymph ...