  One of the most dramatic consequences of low-scale (~1 TeV) quantum gravity
is copious production of mini black holes at future accelerators and in
ultra-high-energy cosmic ray interactions. Hawking radiation of these black
holes is constrained mainly to our (3+1)-dimensional world and results in rich
phenomenology. We discuss tests of Wien's law of Hawking radiation, which is a
sensitive probe of the dimensionality of extra space, as well as an exciting
possibility of finding new physics in the decays of black holes.
