How can our societies be stabilized in a crisis? Why can we enjoy and understand Shakespeare? Why are fruitflies uniform? What makes the Mona Lisa's smile beautiful? - Is there any answer to these questions? This book shows that the statement: "weak links stabilize complex systems" holds the key to understanding all of the intriguing puzzles above. The distinguished author uses weak links as a thread to introduce a vast variety of networks from proteins to ecosystems. This unique book and the ideas it develops will have a significant impact on many, seemingly diverse, fields of study.