Feynman and relativity!

Did Feynman ever say he tried to derive relativity himself and couldn’t understand how Einstein did it?

Paul Mainwood

Feynman did say something quite close to that. A few things to make clear. First, he was talking about the General Theory of Relativity, not in any way the Special Theory. And second, Feynman did derive GR, but did so in a very different way to Einstein himself. In doing so, he expressed his amazement that Einstein managed to succeed on his original path.