What if you never had to do a smell test for spoiled milk again? Instead of having to take a whiff of the sour liquid, you could just check the color of a small tag placed on the container.
This is exactly what researchers at Peking University in Beijing, China, are working on: color-coded "smart tags."
These corn kernel-sized tags can be stuck to containers of food or medicine and have the capabilities of determining whether the food has gone bad or if the medications are still active. What's more, these tags will reportedly cost less than one penny each. … Read more