Mug with a temperature sensor($28) from Art Lebedev. You will find the silhouette of a battery symbol on the outside, a temperature strip become visible only when the mercury rises to 36 degrees Celcius (96.8 Fahrenheit) "The image becomes visible if you pour a drink hotter than 36 degrees Celcius (96.8 Fahrenheit)."~
via : artlebedev
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