Researchers at Carnegie Mellon University have developed a paper that can track touch, could lead to an inexpensive way to digitize writing. The paper itself is your typical -mill paper, but conductive material is applied to the back. While looking for the best conductive material, the researchers wanted to make it inexpensive. The team decided on a carbon - loaded plastic sheet, that would stick to the paper and then carbonloaded paint that can be sprayed on. Once a sensor board is connected to the sheet of paper, it allows touch --whether it be from a finger, a pen or a stylus -- to be digitized and applied in a variety of ways. The design resulted in a cost of around $0.30 per sheet. Price can likely be reduced through large-scale production.