  In classical physics, probabilistic or statistical knowledge has been always
related to ignorance or inaccurate subjective knowledge about an actual state
of affairs. This idea has been extended to quantum mechanics through a
completely incoherent interpretation of the Fermi-Dirac and Bose-Einstein
statistics in terms of "strange" quantum particles. This interpretation,
naturalized through a widespread "way of speaking" in the physics community,
contradicts Born's physical account of {\Psi} as a "probability wave" which
provides statistical information about outcomes that, in fact, cannot be
interpreted in terms of 'ignorance about an actual state of affairs'. In the
present paper we discuss how the metaphysics of actuality has played an
essential role in limiting the possibilities of understating things
differently. We propose instead a metaphysical scheme in terms of powers with
definite potentia which allows us to consider quantum probability in a new
light, namely, as providing objective knowledge about a potential state of
affairs.
