Richard Feynman was a theoretical physicist known for his contributions to quantum electrodynamics (QED) and his uncanny ability to simplify complex concepts. He developed 'Feynman Diagrams,' a visual representation of the behavior of subatomic particles that revolutionized particle physics. Feynman was a key member of the Manhattan Project and later famously identified the cause of the Challenger space shuttle disaster by demonstrating how O-rings fail in cold temperatures. His 'Feynman Technique' for learning—explaining a topic in simple terms to find gaps in one's own understanding—remains a popular study method. He shared the 1965 Nobel Prize in Physics for his work on QED, which accurately describes how light and matter interact. Image of a Feynman diagram showing electron-positron annihilation