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The origin of the terms "hard science" and "soft science" is obscure. The earliest attested use of "hard science" is found in an 1858 issue of the Journal of the Society of Arts, [17] [18] but the idea of a hierarchy of the sciences can be found earlier, in the work of the French philosopher Auguste Comte (1798‒1857).
HSAB is an acronym for "hard and soft (Lewis) acids and bases".HSAB is widely used in chemistry for explaining the stability of compounds, reaction mechanisms and pathways. It assigns the terms 'hard' or 'soft', and 'acid' or 'base' to chemical species.
An epenthetic /j/ is inserted before a post-vocalic soft consonant, yielding a diphthong. If the soft consonant occurs before /ɛ/ or /ɪ/, it is often realized as hard, and the vowels merge to . [8] [example needed] In literary language, the contrast between hard and soft consonants is neutralized in word-final position.
Empiricism in the philosophy of science emphasizes evidence, especially as discovered in experiments. It is a fundamental part of the scientific method that all hypotheses and theories must be tested against observations of the natural world rather than resting solely on a priori reasoning, intuition , or revelation .
Hard science fiction is a category of science fiction characterized by concern for scientific accuracy and logic. [ 1 ] [ 2 ] [ 3 ] The term was first used in print in 1957 by P. Schuyler Miller in a review of John W. Campbell 's Islands of Space in the November issue of Astounding Science Fiction .
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Soft science fiction, or soft SF, is a category of science fiction with two different definitions, in contrast to hard science fiction. [1] It explores the "soft" sciences (e.g. psychology , political science , sociology ), as opposed to the "hard" sciences (e.g. physics , astronomy , biology ). [ 1 ]
"Extraordinary claims require extraordinary evidence" (sometimes shortened to ECREE), [1] also known as the Sagan standard, is an aphorism popularized by science communicator Carl Sagan. He used the phrase in his 1979 book Broca's Brain and the 1980 television program Cosmos .