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A doppelgänger [a] (/ ˈ d ɒ p əl ɡ ɛ ŋ ər,-ɡ æ ŋ-/ DOP-əl-gheng-ər, -gang-), sometimes spelled doppelgaenger or doppelganger, is a ghostly double of a living person, especially one that haunts its own fleshly counterpart.
Doppelganger: A Trip into the Mirror World is a 2023 memoir and political analysis by Canadian author, social activist, and filmmaker Naomi Klein. In it, Klein examines the current climate of political polarization and conspiracy thinking , by contrasting Klein's worldview with that of Naomi Wolf , with whom Klein is often confused.
In physics, the twin paradox is a thought experiment in special relativity involving twins, one of whom takes a space voyage at relativistic speeds and returns home to find that the twin who remained on Earth has aged more.
In the eternal inflation theory, which is a variant of the cosmic inflation theory, the multiverse or space as a whole is stretching and will continue doing so forever, [68] but some regions of space stop stretching and form distinct bubbles (like gas pockets in a loaf of rising bread). Such bubbles are embryonic level I multiverses.
The interaction of world 2 and world 3 is based on the theory that world 3 is partially autonomous. For example, the development of scientific theories in world 3 leads to unintended consequences, in that problems and contradictions are discovered by world 2. Another example is that the process of learning causes world 3 to change world 2.
The researchers are mindful of the possibility of unintended consequences in terraforming another world for humankind's benefit. Scientists, for instance, are eager to learn whether Mars has ...
In case you haven't, we have your back with a list full of fresh facts from the “Today I Learned” subreddit. Scroll d Gaining new knowledge is vital for individuals’ cognitive functions ...
Some philosophers believe that such science-fiction thought experiments (like the Twin-Earth) should be examined carefully. They argue that when a thought experiment describes a state of affairs that is radically different from the actual one (or what we think it to be), our intuitions can become unreliable, and hence the philosophical ...