The ultimate test of understanding (The Feynman Technique) | Marvin Liyanage Although there are valid critiques of Richard Feynman, few dispute his scientific contributions and even less his ability to explain complex topics masterfully. In his interview with BBC2, Fun To imagine, he shares his belief that there are no miracle people — anyone can learn to understand complex topics like quantum mechanics. The Feynman Technique is a test of deep understanding. As the saying goes: "If you can't exp