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(CNN) -- Two German students have created a device that will stop beer lovers having to get out of their seats for a refill. The 'smart' beer mat, created by Matthias Hahnen and Robert Doerr from Saarland University in Saarbruecken, southwest Germany, can sense when a glass is nearly empty, sending an alert to a central computer behind the bar so waiters know there are thirsty customers.
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