In "Q.E.D.," Burkard Polster embarks on an extraordinary journey through the enchanting world of mathematical proofs, unveiling the beauty and simplicity underlying some of the most complex and celebrated problems in mathematics. With a storyteller's flair, Polster invites readers into a realm where Pythagoras's theorem unfolds with intuitive clarity, and ancient Chinese puzzles reveal their secrets through elegant solutions. This book is not merely a collection of mathematical curiosities, but a celebration of the human mind's capacity to solve, deduce, and understand the universe's fundamental truths. Polster skillfully demystifies the mysteries of pi, explores the practicality of squaring the circle, and recounts how the slicing of cones not only advanced geometry but also played a pivotal role in historical events and space exploration. "Q.E.D." is a testament to mathematical beauty, accessible to those with a fleeting interest in mathematics and enriching for the seasoned mathematician. Through vivid storytelling and insightful exposition, Polster proves that mathematics is not a cold abstraction, but a dynamic and compelling narrative woven into the fabric of our lives.