Hot dry rock geothermal energy Hot dry rock geothermal energy Hot dry rock (HDR) is an abundant source of geothermal energy available for use. A vast store of thermal energy is contained within hot - but essentially dry - impervious crystalline basement rocks found almost everywhere deep beneath the earth’s surface. A concept for the extraction of useful amounts of geothermal energy from HDR originated at the Los Alamos National Laboratory in 1970, and Laboratory researchers were awarded a U.S. patent covering it. Although often confused with the relatively limited hydrothermal resource already commercialized to a large extent, HDR geothermal energy is very different. Whereas
Note from the Underground (Buffy comic) Note from the Underground (Buffy comic) "Note from the Underground" is a story arc that was originally published in "Buffy the Vampire Slayer" #47–50 by Dark Horse Comics and based on the "Buffy" television series. It was later reprinted in a trade paperback collected edition. Angel breaks Faith out of jail and the two of them travel to Sunnydale to help control chaos there. Angel, Faith, and Pike continue to look for Buffy, whilst the Slayer battles vampires in Hell. Buffy must continue her journey through Hell, and meets help (Angel, Faith, and Pike). It is up to them to