Mistery solved

(je cite, je cite) livro novo do Feynman, comentário antes de uma das cartas:

"In 1931 the great physicist Paul Dirac argued convincingly that there may exist in nature magnetic monopoles, fundamental particles out of which emerge radially pointing magnetic fields, analogous to the electric fields that stick out of an electron or proton, and he predicted the strength of such a monopole's magnetic field."

Ah, bom.