Hot dry rock geothermal energy makes use of hot fluids found naturally in basement rock; but such HWR conditions are rare. By far the bulk of the world’s geothermal resource base (over 98%) is in the form of basement rock that is hot but dry—with no naturally available water. This means that HDR technology is applicable almost everywhere on earth (hence the claim that HDR geothermal energy is ubiquitous). Typically, the temperature in those vast regions of the accessible crystalline basement rock increases with depth. This geothermal gradient, which is the principal HDR resource variable, ranges from less than 20 °C/km to over 60 °C/km,
Notes from Underground deriving inspiration from Dostoevsky's novella. Notes from Underground Notes from Underground (pre-reform Russian: ; post-reform ), also translated as Notes from the Underground or Letters from the Underworld, is an 1864 novella by Fyodor Dostoevsky. "Notes" is considered by many to be one of the first existentialist novels. It presents itself as an excerpt from the rambling memoirs of a bitter, isolated, unnamed narrator (generally referred to by critics as the Underground Man), who is a retired civil servant living in St. Petersburg. The first part of the story is told in monologue form, or the underground man's diary, and