  What can we discover? As the discussion in this paper is limited to
ontological considerations, it does not deal with the discovery of new
concepts. It raises the following question: What are the entities or existents
that we can discover? There are two kinds of such entities: (1) actual
entities, and (2) possible entities, which are pure possibilities. The paper
explains why the first kind of discovery depends primarily on the second kind.
The paper illustrates the discoveries of individual pure possibilities by
presenting examples such as the Higgs particle, Dirac's positron, and
Pauli-Fermi's neutrino.
