We live in a big and wonderful country - Russia. A country with a thousand-year history!And what is history? This is what happened in the past - five, a hundred, a thousand years ago. There is a place for everything in history - victories, sorrows, and joys.The creators of history are people. This book is about Dmitry Ivanovich Mendeleev. He is the most famous Russian chemist, the discoverer of one of the fundamental laws of nature. Everything that his thought turned to, he brought into a coherent system.For senior preschool and primary school age.