  Since the original baryonic dark matter detection from quasar microlensing
was first announced in 1996, substantial strides have been made in confirming
the rapid microlensing signature in the Q0957 system and in other gravitational
lens systems. The most rapid event recognized had a 1% amplitude and a 12-hour
duration.
  Interpretation of the rapid fluctuations has centered upon 3 offered
explanations; microlensing of fine quasar structure by a population of planet
mass astronomical bodies in the lens galaxy, orbiting bright structures in the
accretion disc of the supermassive black hole of the quasar, or dark clouds
swarming around the luminous quasar source. The observations, particularly the
equal positive and negative fluctuations, seem to strongly favor the
cosmological population of planetary mass objects in the lens galaxy.
  Of the several ideas advanced for the origin of such a population, the most
appealing seems to be their birth at the time of recombination 300,000 years
after the Big Bang.
