A team of researchers from the University of Illinois has figured out how to make a pen that lays down functioning electrical circuits as it draws.
The pen, which uses conductive silver ink, is able to make circuits on paper, wood and other flexible surfaces. The idea behind it is to then use the ink in a printer, so they could manufacture a circuit-printing inkjet printer.
In a test, they were able to add a battery and some LED lights to a piece of paper they had drawn circuits on, and the lights lit up just as they should have. What uses will they find for this thing? That much isn't too clear, but it's just neat that they were able to do it in the first place, eh?