] The team created a glass block, two centimetres in diameter
] and three millimetres thick, containing about 400,000 to
] 500,000 individual channels.
]
] Thanks to a phenomenon called the electric double layer,
] when water flows through these 10-micron-diameter-wide
] channels, a positive charge is created at one end of the
] block and a negative charge at the other - just like a
] conventional battery.

Canadian team invents new power source, no moving parts, may be useful for powering nanotech devices.

BBC NEWS | Technology | Water sparks new power source