h a l f b a k e r y0.5 and holding.
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An ergonomic sterling engine -- vest-shaped perhaps -- straps to your torso and drives a dynamo to charge a supercapacitor. An LED conveniently blinks when the appropriate charge level is reached, at which point in time you helpfully drop the supercap into a waiting mug of water, where it promptly discharges
thereby bringing the water to a vigorous boil.
The supercap has holes drilled into its outer shell and further has an internal separator layer made from compressed coffee grounds. As it floods with the suddenly boiled water, it brews a steaming cup o' joe.
Supercapacitors of a wide variety of blends and flavours would be available in packs of 12.
Machine for Coffee
Machine_20for_20Coffee
Standing on the shoulders... [the porpoise, Feb 05 2015]
[link]
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