Nuclear thermal management is usually taught vertically: pick a reactor, follow its coolant from core to condenser. This bookshelf deliberately cuts the other way. It is organized by discipline — conduction, convection, radiation, phase change, controls, and materials — because that is how the ideas actually travel. The boiling crisis was mapped for water reactors and now sets the limits of two-phase electronics cooling; the heat pipes that cooled a space reactor in the Nevada desert are the primary "loop" of terrestrial microreactors; a Stefan–Boltzmann calculation is a footnote in a textbook and a safety case in a dry cask license.