Jim Al-Khalili explains the experiment that reveals the "central mystery of quantum mechanics": the double slit experiment. Sometimes called the "two-slit" or "Young's" experiment, it demonstrates that matter and energy can display the characteristics of both waves and particles, establishing the principle known as wave-particle duality. Furthermore, it questions the role of the observer in the outcome of events and demonstrates the fundamental limitation of an observer to predict experimental r

Jim Al-Khalili, "The Joy of Science"