The most dangerous thing in your living room is probably still a rogue plug or a Lego brick. But according to some physicists, there could also be thousands of black holes drifting through that same space every year, through your walls, your sofa, even your body, and you’d never know. Not the galaxy-guzzling monsters from Interstellar , but something far stranger: tiny, ancient “primordial” black holes that may have formed in the first heartbeat of the universe. They’re invisible, almost impossible to detect, and some researchers think they might even be what we currently call dark matter. It sounds like the kind of claim you’d hear on a paranoid pseudo-science YouTube channel. It isn’t. This is the stuff serious cosmologists are writing papers about. Black holes, as we usually k

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