Ryumin Vladimir Vladimirovich (1874-1937) - Russian engineer and teacher, popularizer of science and technology. Readers are offered the book "Entertaining Chemistry," which was first published in 1925. In his work, the scientist leads entertaining experiments, talks about the transformation of chemicals, talks about safety precautions and rules of behavior in the laboratory. Provides information on the detailed application of chemical elements in industry and many other interesting scientific topics. Ryumin's book will help to conduct visual experiments with his own hand, as well as prepare the child for studying the school curriculum and expand the knowledge he received in the lessons. The work was reprinted many times, and in 1926 she opened the famous series "Entertaining Science."