  Among particle theory candidates for the dark matter constituents. axions and
WIMPs are the most popular. In this talk we discuss these then focus on our
preferred astrophysical candidate, the Primordial Intermediate Mass Black Holes
in the acronym $DM=PIMBHs$. The earliest experimental confirmation may come
from microlensing of the Magellanic Clouds at the LSST 8m telescope in the
mid-2020s, or possibly a few years earlier in 2021 from work being pursued,
using DECam data from the smaller Blanco 4m tescope, at LLNL.
