  Although the extraordinary weakness of gravity makes it by far the weakest of
the interactions, viewing little black holes (LBH) as a class of elementary
particles puts them in a league with hadrons as strongly interacting particles.
They interact strongly both in the subatomic and macroscopic realms. An
enormous universal gravitational attractive force ~ 10^43 /B 2 Newtons acts
between identical black holes for any mass M >> M Planck at a center-to-center
separation of 2 BR H (B > 1). For M ~ M Planck, there is a comparably large
repulsive force. The Hawking model of LBH radiation permits a luminosity from a
single LBH comparable to that of the entire universe, whereas this luminosity
is greatly attenuated in the Rabinowitz model. In interacting with each other,
and with large macroscopic bodies such as stars, neutron stars, and planets,
LBH can exhibit strong interactions with large-scale manifestations. Although
previously dismissed, an LBH is a potential candidate in accounting for the
1908 devastation of Tungus Siberia, since important LBH interactions were
overlooked. LBH passing through neutron star pulsars are capable of causing a
sudden change in frequency which may not be fully accounted for by other
theories. The existence of black holes is also discussed.
