Stupid question, posed but apparently not answered in TFA: What if a small black hole approached a person, or even came into contact? Would we see it as, say, someone's arm suddenly falling off for no apparent reason? Or would the size of the black hole be so infinitesimal that for practical purposes it wouldn't matter?
FTA: "'I think someone asked me what would happen if a primordial black hole passed through a human body,' recalls Tung, who did a quick pencil-and-paper calculation to find that if such a black hole zinged within 1 meter of a person, the force of the black hole would push the person 6 meters, or about 20 feet away in a single second. Tung also found that the odds were astronomically unlikely that a primordial black hole would pass anywhere near a person on Earth."
FTA: "'I think someone asked me what would happen if a primordial black hole passed through a human body,' recalls Tung, who did a quick pencil-and-paper calculation to find that if such a black hole zinged within 1 meter of a person, the force of the black hole would push the person 6 meters, or about 20 feet away in a single second. Tung also found that the odds were astronomically unlikely that a primordial black hole would pass anywhere near a person on Earth."