  Nuclear mass data provide EMPIRICAL evidence of: 1. Clustering of nucleons;
2. Attractive n-p interactions; and 3. Repulsive but symmetric n-n and p-p
interactions after correcting for the repulsive Coulomb interactions between
positive nuclear charges. These findings suggest a possible source of energy in
neutron stars, in stars which formed on them, and demonstrate the need for a
Theoretical understanding of 1. Interactions between nucleons; 2. Clustering of
nucleons; and 3. Neutron-emission by penetration of the gravitational barrier
surrounding a neutron star.
