The memoirs of contemporaries collected in this collection contain reliable information about the appearance and character of K.E. Tsiolkovsky, about his habits, activities and rest. The testimonies of people who personally knew the scientist will help the reader to get a living idea of ​ ​ Tsiolkovsky. The book will be useful for a wide range of people interested in K.E. Tsiolkovsky as a scientist, citizen, educator.