Nobody wants stale beer. Thanks to a group of chemist-scientists, there is now a smartphone app that can tell if your co...

Nobody wants stale beer. Thanks to a group of chemist-scientists, there is now a smartphone app that can tell if your cold brew has gone stale. A compound called furfural gives aged beer that dreaded stale taste. The chemist team created a polymer sensor that will change colors when it detects furfural in a batch of brew.

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