A new device that can charge your mobile phone with a hot cup of coffee or a cold beer mug has been developed by a US company.
The
company claims that the two-sided Epiphany onE Puck converts the warmth
of your hot cocoa or iced beverage into power for your phone. The
lightweight device is portable enough to store in your purse or day bag
for emergencies.
The device uses a Stirling
engine powered solely by...
