  Unitarity implies that the evaporation of microscopic quasi-classical black
holes cannot be universal in different particle species. This creates a puzzle,
since it conflicts with the thermal nature of quasi-classical black holes,
according to which all the species should see the same horizon and be produced
with the same Hawking temperatures. We resolve this puzzle by showing that for
the microscopic black holes, on top the usual quantum evaporation time, there
is a new time-scale which characterizes a purely classical process during which
the black hole looses the ability to differentiate among the species, and
becomes democratic. We demonstrate this phenomenon in a well-understood
framework of large extra dimensions, with a number of parallel branes. An
initially non-democratic black hole is the one localized on one of the branes,
with its high-dimensional Schwarzschild radius being much shorter than the
interbrane distance. Such a black hole seemingly cannot evaporate into the
species localized on the other branes, that are beyond its reach. We
demonstrate that in reality the system evolves classically in time, in such a
way that the black hole accretes the neighboring branes. The end result is a
completely democratic static configuration, in which all the branes share the
same black hole, and all the species are produced with the same Hawking
temperature. Thus, just like their macroscopic counterparts, the microscopic
black holes are universal bridges to the hidden sector physics.
