At the local office supply store, a roller-ball ge
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Nano-engineers at the University of California, San Diego have invented a technique that turns cheap pens into dispensers for do-it-yourself sensors. They replace the regular gel with a custom biochemical ink that can measure specific chemicals.
http://money.cnn.com/2015/03/10/technology/di...st+News%29
....when consumer demand is great enough.....
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