Genius
Feynman’s particles seemed to be following paths fixed in space and time. This they could not do. The uncertainty principle said so.
“Already we know that the classical idea of the trajectory in a path is not a legitimate idea in quantum mechanics, “ he (Bohr) said, (p. 9)
Today we face a similar argument that social systems cannot be described by deterministic equations because of uncertainty. But deterministic equations are really dealing with averages, not individual cases.