Hugh Everett's work has been described by many people in terms of many worlds, the idea being that every one of the various alternative histories, branching histories, is assigned some sort of reality. ↗
Even while we busily attend meetings, contribute money and perform our assigned tasks, we suspect that we may be helping to create a force that is inimical to many values we hold dear. ↗
If we look at the way the universe behaves, quantum mechanics gives us fundamental, unavoidable indeterminacy, so that alternative histories of the universe can be assigned probability. ↗