A black hole doesn't vanish instantly: after evaporation, it leaves a 'white remnant' that exhales captured information for ages, like a dying star. This means that mini-holes from the dawn of time could be quietly glowing today, and we might spot them.
🎯 The complete evaporation time for a black hole with the mass of a mountain exceeds the age of the Universe by billions of times. And microscopic holes from the dawn of time may be burning out right now, and their last heat could be detected.