Werner Heisenberg can't stop sneezing in the summer of 1925, which happens to be allergy season. The 23-year-old scientist flees to Helgoland, a tiny rocky island in the North Sea, in order to relieve his hay fever symptoms. He starts to ponder carefully about atoms while he is here, finally able to take a deep breath. His discoveries will have a profound impact on physics and our understanding of reality. Based on the excellent storytelling of physicist Carlo Rovelli, these notes recount the intriguing tale of how quantum mechanics came to be discovered and discovered by scientists. As you go through the book, you will learn what Heisenberg's ideas tell us about the bizarre and paradoxical world of subatomic particles, and you will see how his discoveries uncovered issues that continue to confound scientists today. Discover how hay fever helped scientists discover quantum physics, when a thing isn't actually an object, and why multiverses aren't required in these set of notes.