"What is what" series, involving nature, geography, animals, plants, astronomy, geology, science and technology, history, archaeology, art, humanities and other disciplines. For nearly half a century, TESSLOFF Publishing House in Germany has invited several famous scientists or popular science writers to write some illustrated popular science books for teenagers every year, which has formed a scale of nearly 140 volumes. This large-scale popular science series is now a household name in Germany and even Europe, and it is a must-have children's book for every family. This series of popular science knowledge has also accompanied several generations of German children to grow up and become one of their best childhood memories.

Germany is a country of ideas, and education, science and research and development are given a core position. At the beginning of the 20th century, about one third of the Nobel Prizes were awarded to German scientists, whose innovations brought great changes to the world, such as the theory of relativity, nuclear fission, the discovery of tuberculosis and Roentgen rays. Up to now, among 76 German Nobel Prize winners, 65 have won prizes for their achievements in natural science and medicine. In addition to enterprises and universities, Max Planck Institute, Flawn Hof Institute and Helmholtz Federation are all at the forefront of scientific research. The formation of this good scientific atmosphere is related to Germany's tradition of attaching importance to popularizing scientific knowledge among teenagers.

"What is What" produced by China Dolphin Media systematically and comprehensively introduces all kinds of knowledge, beautiful words, rich pictures and German rigorous logical thinking mode embodied in the book. I believe it will also play a positive role in the healthy growth of children in China, broaden their knowledge horizons and help them understand the world.