Carlo Rovelli, one of the world's most famous theoretical physicists, has captivated millions of readers with his unusual view of the cosmos. In Heligoland, he explores the enduring mystery of quantum theory. The quantum world that Rovelli describes is as beautiful as it is unnerving. Heligoland is a treeless island in the North Sea where twenty-three-year-old Werner Heisenberg made a decisive breakthrough in the creation of quantum mechanics, ushering in a century of scientific revolution. The publishing layout of the book is preserved in PDF A4 format.