Found this neat vid on Huffington Post:
This seems like a neat idea but I wonder just how well the cubes really work. In the vid it shows simply "Drink #1, 2 & 3". Does the indicator actually work off of the amount of alcohol or just the fact that the glass at some point was emptied and then refilled??... No one drink is as heavy in alcohol as the next, ya know.
I'd just like to know.
But, at any rate, an invention such as this would definitely help many worldwide.