Scientists to tap river currents to create clean energy

In the eerie green glow of flashing lasers in a darkened University of Michigan lab, a cylinder on springs moves methodically up and down in a giant tank as water flows over it, simulating a stream.

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<p><a href="http://www.physorg.com/news152115803.html">Scientists to tap river currents to create clean energy</a></p> <p>In the eerie green glow of flashing lasers in a darkened University of Michigan lab, a cylinder on springs moves methodically up and down in a giant tank as water flows over it, simulating a stream.</p>