On May 10, Plato Grigoryevich Kostyuk died. Despite the fact that it was known about his serious illness, the news of the death was sudden and tragic. A talented scientist, a brilliant experimenter, an outstanding organizer of science, a wonderful teacher, a kind and wise person passed away. In recent years, we did not meet often, but regularly enough, and Platon Grigoryevich spoke a lot about his past, about his teachers, unexpected turns of fate. It was good, calm and reliable with him.