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Until this study was done, we did not know if these objects could have affected humans. Imagine if they _had_ discovered the ability of PBHs to e.g. puncture a lung, blood vessel, or brain synapse. Maybe we would better understand e.g. crib death, or Alzheimer's disease.

Wouldn't any parent line their baby's crib with the mass equivalent of a million aircraft carriers in lead, to protect them?

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I think that lead would be a bad material to use, considering a baby's propensity to put everything within reach into their mouths starting at a couple of months of age when they can start reaching. When they start teething they will inevitably start chewing on the soft metal.

Babies particularly enjoy chewing on lead (and lead paint) because it tastes sweet.

Are we that out of ideas for crib death and Alzheimer's that black holes would be considered a root cause?

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