[ExI] Primordial Black Holes

[John Clark]

Strange Event Might Have Been A Primordial Black Hole
<https://www.sciencealert.com/strange-event-might-have-been-a-primordial-black-hole-winking-at-us>
* John K Clark    See what's on my list at  Extropolis
<https://groups.google.com/g/extropolis>*

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