BERKELEY, California (WPVI) -- The sniff test for milk may be on its way out.
Engineers at the University of California-Berkeley have created a cap with electronics embedded in it to wirelessly monitor the freshness of milk.
And they did it through 3D printing.
It's one of the first examples of printing a plastic circuit with electronic components in it.
It could eventually be used in many other foods to make sure they are safe.
