The logic of low temperature -- Perpetual motion? -- Metals and theories -- Experiments and their interpretations -- The true image of superconductivity -- Fritz -- Not your everyday liquid -- The Russian cold -- In Cambridge in spite of Stalin, in Moscow because of Stalin -- Superfluidity: theories and polemics -- The war, the bomb, and the cold -- Radar and superconductivity -- The ions also move -- East is east, and west is west -- Now, how to grab the tiger by the tail? -- John Bardeen's relentless pursuit -- The golden age -- After the golden age: tomorrow, always tomorrow -- The age of materials -- A Swiss revolution: the superconducting oxides -- Superconductivity as theater -- Almost twenty years later.