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Dante Gabriel Rossetti, How They Met Themselves, watercolour, 1864. 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.
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.
Brian Randolph Greene [1] (born February 9, 1963) is an American physicist known for his research on string theory.He is a professor of physics and mathematics at Columbia University, director of its center for theoretical physics, and the chairman of the World Science Festival, which he co-founded in 2008.
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.
Phrenology – a theory of highly localised brain function popular in 19th century medicine. Homeopathy – a theory according to which a disease can be cured by infinitesimal doses of the substance that caused it; Eclectic medicine – transformed into alternative medicine, and is no longer considered a scientific theory
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 ...
Popper's theory of these three "worlds" is evolutionary and cosmological. As is consistent with the known universe as presently described by the natural sciences, Popper maintains that the known universe did not contain any World 2 or World 3 at its inception - at its inception there was only a "World 1", a realm where everything consisted of ...
Merton believed that it is multiple discoveries, rather than unique ones, that represent the common pattern in science. [5] Merton contrasted a "multiple" with a "singleton"—a discovery that has been made uniquely by a single scientist or group of scientists working together. [6] The distinction may blur as science becomes increasingly ...