"They never used any of his criteria of putting the corridor on sand, or being very careful. They just went right on running the rats in the same old way, and paid no attention to the great discoveries of Mr. Young, and his papers are not referred to, because he didn't discover anything about the rats."

But what Young discovered, according to Feynman was infinitely more vital.

"In fact, he discovered all the things you have to do to discover something about rats."