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  2. Index of branches of science - Wikipedia

    en.wikipedia.org/wiki/Index_of_branches_of_science

    Eccrinology – study of excretion. Ecology – study of environment. Economics – study of material wealth (production, distribution, and consumption of goods and services). Edaphology – study of soils. Egyptology – study of ancient Egypt. Eidology – study of mental imagery. [2] Ekistics – study of human settlement.

  3. Letter (message) - Wikipedia

    en.wikipedia.org/wiki/Letter_(message)

    A letter is a written message conveyed from one person (or group of people) to another through a medium. [ 1 ] Something epistolary means that it is a form of letter writing. The term usually excludes written material intended to be read in its original form by large numbers of people, such as newspapers and placards, although even these may ...

  4. Branches of science - Wikipedia

    en.wikipedia.org/wiki/Branches_of_science

    Natural sciences: the study of natural phenomena (including cosmological, geological, physical, chemical, and biological factors of the universe). Natural science can be divided into two main branches: physical science and life science (or biology). Social sciences and the humanities: the study of human behavior in its social and cultural aspects.

  5. K–12 education in the United States - Wikipedia

    en.wikipedia.org/wiki/K–12_education_in_the...

    In addition, on the 2005 National Assessment of Education Progress, 4th and 8th-grade students scored as well or better in reading, science, and mathematics. [28] During high school, students (usually in 11th grade) may take one or more standardized tests depending on their post-secondary education preferences and their local graduation ...

  6. Science - Wikipedia

    en.wikipedia.org/wiki/Science

    Science is a systematic discipline that builds and organises knowledge in the form of testable hypotheses and predictions about the world. [1] [2] Modern science is typically divided into two or three major branches: [3] the natural sciences (e.g., physics, chemistry, and biology), which study the physical world; and the behavioural sciences (e.g., economics, psychology, and sociology), which ...

  7. Greek letters used in mathematics, science, and engineering

    en.wikipedia.org/wiki/Greek_letters_used_in...

    t. e. Greek letters are used in mathematics, science, engineering, and other areas where mathematical notation is used as symbols for constants, special functions, and also conventionally for variables representing certain quantities. In these contexts, the capital letters and the small letters represent distinct and unrelated entities.

  8. P versus NP problem - Wikipedia

    en.wikipedia.org/wiki/P_versus_NP_problem

    To attack the P = NP question, the concept of NP-completeness is very useful. NP-complete problems are problems that any other NP problem is reducible to in polynomial time and whose solution is still verifiable in polynomial time. That is, any NP problem can be transformed into any NP-complete problem. Informally, an NP-complete problem is an ...

  9. Letter (alphabet) - Wikipedia

    en.wikipedia.org/wiki/Letter_(alphabet)

    Definition and usage. A letter is a type of grapheme, the smallest functional unit within a writing system. Letters are graphemes that broadly correspond to phonemes, the smallest functional units of sound in speech. Similarly to how phonemes are combined to form spoken words, letters may be combined to form written words.

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