The subject of the multiverse—the possiblity that there are parallel universes, of which we are completely unaware—is a fascinating one. Philosophers have discussed this, too. To my untrained eye, it seems a way to flesh out the idea of “all possible worlds”. But they’re completely theoretical. Or so you’d think.
So imagine our surprise when my wife & one of her PhD students came across a portal to one of those parallel universes.