(I) A new electronic tattoo listens to the sounds of the
human body, including the heart and muscles. (II) The
sensor-loaded skin patch could be used for medical
monitoring, like to detect irregular heartbeats, for
example. (III) Electronic tattoos are a controversial issue
as some people believe that they may harm the body
because of the chemicals they include. (IV) Placed on
the throat, it could also act as a human-machine
interface by picking up the vibrations of your voice, even
in noisy conditions. (V) In one demonstration, people
used it to play games by voice control at a crowded
party