In the 19^th century, aniline (derived from coal tar) was the substance for an industrial chemistry revolution—in dyes, paints, plastics, drugs, et al.  Now, researchers at Stanford have found another application for aniline, mixed with phytic acid, in making a hydrogel that can be inkjet printed on surfaces, leaving a porous structure with remarkable electrical conductivity.  Among other things, this could result in medical sensors that detect chemicals and send a quick electrical signal.              MORE