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by hughes 4621 days ago
It's nothing to do with microwaves. It sloshes the drink around in a bath of chilled water while rotating it. It appears to save energy by keeping the chilled water thermally isolated from the environment rather than keeping an entire fridge cool. Very similar to the Salted Ice Water method[1]

[1] http://www.wikihow.com/Chill-a-Drink-Quickly