The 15-Minute City is an urban planning concept with the idea that everyday destinations such as schools, stores, and offices should be only a short walk or bike ride away from home. The concept, born in Paris from Morenos research work at the Sorbonne University, is now spreading around the world--in fact, a group of nearly 100 mayors worldwide embraced this as a way to help recover from the pandemic. Why is it such a success? Why has it become so widespread in all continents and in such different geographical, economic, social, cultural, and political contexts?  This book is not an academic book explaining the concept. It will tell the story of an idea, almost like a puzzle, that spreads from city to city, and which describes another way of life in a time when our world needs it the most in the face of our multiple difficulties. Climate change, an urbanized world, repeated economic and social crises, the COVID-19 pandemic, the war in Ukraine and the energy, materials, and inflation crisis...  The concept of the 15 Minute City is known worldwide, and more and more cities are planning for less car-centric cities to reduce ecological impact and maximize social benefits of living in human-centric cities.  Moreno will share a journey through happy proximity around the world, and offer a new path for changing our habits and offering a quality of life we had lost--that of our valuable time, which the 15-Minute City would give back. This is a timely topic as cities worldwide have embraced the concept as a way to recover from the Covid pandemic, and demand for speaking on the topic has increased exponentially. Moreno offers scientifically developed, research-backed solutions by bringing an innovative perspective to urban issues and focusing on how technology can help create sustainable cities. Foreword: written by Jan Gehl (Denmark), considered to be the most influential urban planner in the world today; famous for refocusing design and planning on the human scale. Author of Life Between Buildings; Public Spaces, Public Life; and Cities for People, among other books Afterword: written by Martha Thorne, iconic American architect; previously executive director of the Pritzker prize (Nobel prize for architecture) and currently senior adviser to the Obel award