A mobile phone charger is being developed by researchers that can be powered by either a cold beer or a hot coffee.

Owners use the red side as a drinks coaster to place a hot drink on it, and the blue side as for a cooling drink such as a beer.
It uses something called a Stirling engine to turn heat into energy.
US company Epiphany Labs, based in New Castle, Pennsylvania, has built a working prototype and hopes to have it on the market early in 2014.
The company is still vague on just how long it takes for the device to charge up a phone because there are a lot of variables at play, including how hot or cold the source is.
Any source of heat that can fit on the Puck will work.
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Epiphany is aiming to raise 63,000 pounds on fund raising website Kickstarter to turn the prototype into a gadget that can be mass-manufactured.
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Source-ANI