Is intelligence heritable? Karl-Friedrich Fischbach and Martin Niggeschmidt show that "heritability" means something different in biological terminology than in everyday language - which almost inevitably leads to misinterpretations. They explain why twin studies are controversial - and why genetic predictions of IQ and "educational attainment" must be treated with skepticism. This book is a translation of the original German 2nd edition Erblichkeit der Intelligenz by Karl-Friedrich Fischbach & Martin Niggeschmidt, published by Springer Fachmedien Wiesbaden GmbH, part of Springer Nature in 2019. The translation was done with the help of artificial intelligence (machine translation by the service DeepL.com). A subsequent human revision was done primarily in terms of content, so that the book will read stylistically differently from a conventional translation. Springer Nature works continuously to further the development of tools for the production of books and on the related technologies to support the authors.