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Pencil and paper helped create the smart sensor.

University of Missouri, Yahoo notes , used a regular pencil to create a wearable device that provides bioelectric monitoring of a person’s condition. Pencils with a stylus made from more than 90% graphite consume a significant amount of energy when a person writes them on paper.
Pencil and paper helped create the smart sensor.

Graphite can act as a sensitive electrode, and paper as a flexible supporting structure. A team of researchers found that pencils with 93% graphite lead worked best. 

Moreover, the fact that they used paper didn't seem to limit the type of wearable devices they could create. The team says there is potential to create devices that monitor things like a person's temperature and glucose levels. Moreover, the sensors can work in real time and provide reliable data.

The advantages of paper-based pencils and health monitors are twofold. First, the materials needed to create them are inexpensive and easily accessible. Unlike plastic and some other things that we now make medical devices out of, they also decompose quickly. Researchers see a future in which people use this technology for individual home care. It can also help with remote research, especially during the crisis we are seeing now with the coronavirus pandemic.

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