Ment
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This is usually translated as wormholes. Worm holes, if I'm not mistaken. And the first thing that comes to mind is the Discovery Channel series on this topic, hosted by Morgan Freeman, and Nebo still has another show from there in his signature... Although it's a bit simplistic.
Overall, I think we'll take this clue, and the solutions here were pretty good. But regarding the Shamrock riddle: the entrances are indeed black holes. And the exits could be neutron stars, I think... Although I don't remember where they predicted the exits, I might be wrong, but the entrances are definitely black holes.
Overall, I think we'll take this clue, and the solutions here were pretty good. But regarding the Shamrock riddle: the entrances are indeed black holes. And the exits could be neutron stars, I think... Although I don't remember where they predicted the exits, I might be wrong, but the entrances are definitely black holes.