Here's a more detailed article about the device from The Economist: http://www.economist.com/news/science-and-technology/21677612-hitherto-obscure-piece-physics

Here's a more detailed article about the device from The Economist: http://www.economist.com/news/science-and-technology/21677612-hitherto-obscure-piece-physics-may-be-secret-ocean-power http://www.economist.com/news/science-and-technology/2167761...