Difference engine
A head of steam
Geothermal power sheds its hot-spring roots
Oct 24th 2014
Here's a great piece on steam and the part it plays with Renewable Energies.
See the full article
http://www.economist.com/news/science-and-technology/21628216-geothermal-power-sheds-its-hot-spring-roots-head-steam?fsrc=email_to_a_friend
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