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
Notes from Underground serfs, Russia was still very much a post-medieval, traditional peasant society. However, when "Notes From Underground" was written, there was an intellectual ferment on discussions regarding religious philosophy and various 'enlightened' utopian ideas. Dostoevsky, however, along with his notable contemporary, Soren Kierkegaard, rejected such ideas for proto-existentialist themes. Most importantly, the legacy that the work leaves is a challenge to and a method of understanding the larger implications of a utopian society. Utopianism largely pertains to a society's collective dream, but what troubles the Underground Man is this very idea of collectivism. The point the Underground Man makes is that