Pyotr Leonidovich Kapitsa - Soviet physicist, engineer and innovator. Nobel Prize Laureate (1978). Founder of the Institute of Physical Problems (IFP), whose director remained until the last days of his life. One of the founders of the Moscow Institute of Physics and Technology. Letters from Pyotr Leonidovich Kapitsa are letters of conversation, letters of conversation. Even the most sometimes business, oddly enough. When the person he needed to talk to was in distant lands or unavailable for other reasons, he would sit down at a table and write a letter. The circle of his interlocutors is wide. From the mother and first wife of Nadezhda Chernosvitova to the Soviet leaders - Stalin, Khrushchev and Brezhnev.