smart pen

10 most useful inventions in 2011
Recently, 10 awards for the contribution of human science in 2011 have been published, all not only useful but also interesting.
Smart pen can be written on any material
An Israel-based technology company has developed a smart pen capable of writing text on any surface and integrating the function of displaying messages to user phones.
Pen draws the circuit on paper
A group of professors and students at the University of Illinois at Urbana-Champaign, USA, invented a rollerball pen with silver ink, which helps draw electrical circuits on paper,