  While the energy of the universe has been established to be about 0.04
baryons, 0.24 dark matter and 0.72 dark energy, the cosmological entropy is
almost entirely, about $(1 - 10^{-15})$, from black holes and only $10^{-15}$
from everything else. This identification of all dark matter as black holes is
natural in statistical mechanics. Cosmological history of dark matter is
discussed.
