About the book: 2021 / Pyotr Leonidovich Kapitsa - Soviet physicist, engineer and innovator. Nobel Prize winner (1978). Founder of the Institute of Physical Problems (IPP), whose director remained until the last days of his life. One of the founders of the Moscow Institute of Physics and Technology. The letters of Pyotr Leonidovich Kapitsa are letters-conversations, letters-conversations. Even the most businesslike ones at times, oddly enough. When the person he needed to talk to was in distant lands or otherwise unavailable, he sat down at the table and wrote 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. In these letters, famous historical figures, scientists and relatives of the author, like himself, appear before us from an unexpected side. We have never known them like this before. The purpose of the book is indicated by the author himself: “In words only love is explained, but one should write about deeds. The publishing layout of the book is saved in PDF A4 format.