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

Nobel laureate Sir Roger Penrose explains one of the most iconic demonstrations of quantum physics: the double-slit experiment. This experiment shows how electrons can act like a wave and a particle. Electrons are fired through two slits and onto a screen. If you place a detector at the slits, you will see each electron act like a particle and travel through one of the slits and hit the screen at the back. But if you don't detect the electrons as they travel through the slits, the screen will sh

What Feynman Discovered About Reality That NO ONE Can Explain This video is inspired by The Feynman Lectures on Physics Volume III, and follows the way Feynman explained these ideas. There's an experiment so simple a child could understand it. You shoot particles at a wall with two slits. You watch where they land. But something impossible happens. When you're not watching, particles create an interference pattern - like waves going through both slits at once. The moment you observe which slit t