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
Note from the Underground (Buffy comic) return Sunnydale to its natural state. Buffy rescues Xander and Dawn from The Scourge. Buffy must fight for her friends' and family's lives, and also for the right to live her own life, Faith and Angel help. "Buffy" comics such as this one are not usually considered by fans as canonical. However, unlike fan fiction, overviews summarizing their story, written early in the writing process, were approved by both Fox and Joss Whedon (or his office), and the books were therefore later published as officially Buffy merchandise. Note from the Underground (Buffy comic) "Note from the Underground" is a story