Affordable paper sensors aren't exactly new. Think home pregnancy tests. But researchers out of the University of Texas at Austin are pushing (or is it folding?) the envelope with their origami-inspired 3D paper sensor that, thanks to strategic folding, can identify more substances in more complex tests.
Able to be printed at less than a dime a sensor using an ordinary office printer and less than a minute of folding, the origami Paper Analytical Device (which they've dubbed oPAD) "is about medicine for everybody," said Richard Crooks, a chemistry professor who built the sensor with doctoral student Hong Liu, in a school news release.