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Re:Vessyl, the smart cup that knows exactly what you're drin... by character0 on Thursday June 12, 2014 @01:27PM (#7884744)
Another option is that they use a capacitive sensor, which reminds me of the smart pill bottles being developed by AdhereTech and others (http://www.theverge.com/2014/1/8/5289022/adheretech-smart-pi...).

Although, I think this is less likely- I like your guess better.

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