Hot dry rock geothermal energy as a separate state from that of the continuum of permeable rock—just as one would consider a completely closed faucet as distinct from one that is open to any degree, whether the flow be a trickle or a flood. In the same way, HDR technology should be regarded as totally distinct from EGS. A definitive book on HDR development, including a full account of the experiments at Fenton Hill, was published by Springer-Verlag in April 2012. Hot dry rock geothermal energy Hot dry rock (HDR) is an abundant source of geothermal energy available for use. A vast store of thermal
Guitar Hero Encore: Rocks the 80s Court judge stating that Activision had obtained the proper licensing for the works and that the band itself no longer held the copyright on the work. Guitar Hero Encore: Rocks the 80s Guitar Hero Encore: Rocks the 80s (titled Guitar Hero: Rocks the 80s in Europe) is a music rhythm game and the third installment in the popular "Guitar Hero" series. It was released in July 2007 in North America and Europe, and in August 2007 in Australia. Players use a guitar-shaped controller (purchased separately) to simulate playing rock music by hitting notes as they scroll towards the player. "Rocks