Do you understand the construction of the horse cart? Can you explain why a tipple-top toy will tipple? Why don't we have a space elevator yet? And more. The explanations of these riddles may seem complex at first sight, but they are simple when you use your creativity and lateral thinking. In this book, 'Technical riddles', a collection of technical riddles are explained in detail with many providing hyperlinks to resources for even more information related to the subject. Technical riddles are commonly used in job interviews in the engineering sector. This book will help you to fully develop your technical skills. After publication from the first edition, I received many remarks. Also, we had extensive discussion about the explanation from some riddles. More info can be found on the LinkedIn group ‘Technical riddles’. In this 2nd edition all receive remarks and extra explanations are added. Laurens van Lieshout (1952) As the manager of an engineering department I was responsible for hiring engineers. I used these riddles selecting good engineers. For the reader who is interested in solving these riddles, have fun.