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  2. Principle of double effect - Wikipedia

    en.wikipedia.org/wiki/Principle_of_double_effect

    The principle of double effect – also known as the rule of double effect, the doctrine of double effect, often abbreviated as DDE or PDE, double-effect reasoning, or simply double effect – is a set of ethical criteria which Christian philosophers have advocated for evaluating the permissibility of acting when one's otherwise legitimate act ...

  3. Observer effect (physics) - Wikipedia

    en.wikipedia.org/wiki/Observer_effect_(physics)

    In physics, the observer effect is the disturbance of an observed system by the act of observation. [1] [2] This is often the result of utilising instruments that, by necessity, alter the state of what they measure in some manner. A common example is checking the pressure in an automobile tire, which causes some of the air to escape, thereby ...

  4. Copenhagen interpretation - Wikipedia

    en.wikipedia.org/wiki/Copenhagen_interpretation

    Some basic principles generally accepted as part of the interpretation include the following: [2] Quantum mechanics is intrinsically indeterministic. The correspondence principle: in the appropriate limit, quantum theory comes to resemble classical physics and reproduces the classical predictions.

  5. Birefringence - Wikipedia

    en.wikipedia.org/wiki/Birefringence

    Birefringence is responsible for the phenomenon of double refraction whereby a ray of light, when incident upon a birefringent material, is split by polarization into two rays taking slightly different paths.

  6. Twin paradox - Wikipedia

    en.wikipedia.org/wiki/Twin_paradox

    Principle of relativity; Theory of relativity ... are necessary to explain the effect, ... at turnaround has to produce a contrary effect of double that amount: 4 ...

  7. Huygens principle of double refraction - Wikipedia

    en.wikipedia.org/wiki/Huygens_principle_of...

    Huygens principle of double refraction, named after Dutch physicist Christiaan Huygens, explains the phenomenon of double refraction observed in uniaxial anisotropic material such as calcite. When unpolarized light propagates in such materials (along a direction different from the optical axis ), it splits into two different rays, known as ...

  8. What’s behind the John Fetterman body double conspiracy theory?

    www.aol.com/news/behind-john-fetterman-body...

    Origins of the body double theory. US Senator John Fetterman (D-PA) and his wife Gisele Barreto Fetterman arrive for the White House Correspondents' Association dinner at the Washington Hilton in ...

  9. Double-slit experiment - Wikipedia

    en.wikipedia.org/wiki/Double-slit_experiment

    The double-slit experiment (and its variations) has become a classic for its clarity in expressing the central puzzles of quantum mechanics. Richard Feynman called it "a phenomenon which is impossible […] to explain in any classical way, and which has in it the heart of quantum mechanics. In reality, it contains the only mystery [of quantum ...