The year 2027 marks a remarkable double anniversary: 100 years since Werner Heisenberg formulated the uncertainty principle and 100 years since Georges Lemaître laid the foundations of Big Bang cosmology. A century later, what have we learned about the cosmos, life, and consciousness? 

To approach this question, we must travel the paths opened by the great scientists and philosophers who devoted themselves to understanding reality and our place within it. 

This book takes you on a journey through the challenges and discoveries of modern science. It begins with an inventory of what we can know and how we can know it, exploring the relationship between the world and the self. From there, the journey leads into the depths of quantum physics, where the microcosm reveals its strange and fascinating nature. We then follow the unfolding play of the universe through space and time, moving onward to Earth sciences and finally into the realm of life itself. 

Along the way, we encounter the great themes of biology, from cells and evolution to ecosystems. Here we enter the world of biological games: tit-for-tat, rock-paper-scissors, and the curious chef-and-waiter game played in the restaurant of the ecological niche. 

At the midpoint of the journey, we gather around the campfire of neuroscience and philosophy of mind. There, the enduring mysteries of consciousness come into view, inviting us to reflect on David Chalmers' famous distinction between the “easy” problems of cognition and the “hard” problem of subjective experience. 

The journey is demanding, but it leads to the frontiers of contemporary science. Along the way, we travel in the company of some of humanity's most influential explorers of reality, from Aristotle, Einstein, and Kant, to Kauffman, Dawkins, Chalmers, and many others who have helped illuminate the nature of the cosmos, life, and consciousness. 

One hundred years after Heisenberg and Lemaître, uncertainty remains our constant companion. Yet one of the deepest lessons of modern science is that order emerges out of chaos, and uncertainty is the mother of complexity.