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  2. General relativity - Wikipedia

    en.wikipedia.org/wiki/General_relativity

    General relativity, also known as the general theory of relativity and Einstein's theory of gravity, is the geometric theory of gravitation published by Albert Einstein in 1915 and is the current description of gravitation in modern physics. General relativity generalizes special relativity and refines Newton's law of universal gravitation ...

  3. International Phonetic Alphabet - Wikipedia

    en.wikipedia.org/wiki/International_Phonetic...

    It was devised by the International Phonetic Association in the late 19th century as a standardized representation of speech sounds in written form. [1] The IPA is used by lexicographers, foreign language students and teachers, linguists, speech–language pathologists, singers, actors, constructed language creators, and translators.

  4. Amino acid - Wikipedia

    en.wikipedia.org/wiki/Amino_acid

    General structure The 21 proteinogenic α-amino acids found in eukaryotes , grouped according to their side chains' p K a values and charges carried at physiological pH (7.4) 2- , alpha- , or α-amino acids [20] have the generic formula H 2 NCHRCOOH in most cases, [b] where R is an organic substituent known as a " side chain ".

  5. Standard Model - Wikipedia

    en.wikipedia.org/wiki/Standard_Model

    The development of the Standard Model was driven by theoretical and experimental particle physicists alike. The Standard Model is a paradigm of a quantum field theory for theorists, exhibiting a wide range of phenomena, including spontaneous symmetry breaking, anomalies, and non-perturbative behavior.

  6. List of emoticons - Wikipedia

    en.wikipedia.org/wiki/List_of_emoticons

    This is a list of emoticons or textual portrayals of a writer's moods or facial expressions in the form of icons. Originally, these icons consisted of ASCII art, and later, Shift JIS art and Unicode art. In recent times, graphical icons, both static and animated, have joined the traditional text-based emoticons; these are commonly known as emoji.

  7. Academic grading in the United States - Wikipedia

    en.wikipedia.org/wiki/Academic_grading_in_the...

    Papua New Guinea. v. t. e. In the United States, academic grading commonly takes on the form of five, six or seven letter grades. Traditionally, the grades are A+, A, A−, B+, B, B−, C+, C, C−, D+, D, D− and F, with A+ being the highest and F being lowest. In some cases, grades can also be numerical. Numeric-to-letter-grade conversions ...

  8. William Preble Hall - Wikipedia

    en.wikipedia.org/wiki/William_Preble_Hall

    Awards. Medal of Honor. Signature. William Preble Hall (June 11, 1848 – December 14, 1927) was a United States Army brigadier general who was awarded the Medal of Honor for valor in action on October 20, 1879 near the White River in Colorado. An 1868 graduate of West Point, he served in the Army until his retirement in 1912.

  9. General American English - Wikipedia

    en.wikipedia.org/wiki/General_American_English

    General American English, known in linguistics simply as General American (abbreviated GA or GenAm ), is the umbrella accent of American English spoken by a majority of Americans, encompassing a continuum rather than a single unified accent. [1] [2] [3] It is often perceived by Americans themselves as lacking any distinctly regional, ethnic, or ...