  Primordial black holes (PBHs) are of special interest because of the crucial
role of quantum effects in their formation and evaporation. This means that
they provide a unique probe of the early universe, high-energy physics and
quantum gravity. We highlight some recent developments in the subject,
including improved limits on the fraction of the Universe going into
evaporating PBHs in the mass range $10^{9} - 10^{17}$ g and the possibility of
using PBHs to probe a cosmological bounce.
