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5. Nonetheless, the suggestion was raised that predictions of evaporation may depend on the unknown physics at the Planck Scale, which remain unknowable. Even though we have many theoretical reasons to expect that microscopic black holes quickly evaporate, Giddings and Mangano felt compelled to study the case where, argumendo, the microscopic black holes did not evaporate and ask the question was it conceivable that they pose a risk to Earth.