Self-heating Beverage Can

"Beginning Jan. 2, consumers can buy a 10-ounce container of Wolfgang Puck gourmet latte at the store and heat it by pressing a button. No electricity. No batteries. No appliances... How does the can do it? A single step mixes calcium oxide (quicklime) and water. It heats the coffee to 145 degrees in six minutes — and stays hot for 30 minutes."
via: Engadget
update: the pic you see is from Nescafé, by Nestlé in Europe; the similar technology have also been tested it in Asia; and with the news, the idea just came to the US--actually rather late.
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