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  2. Logarithm - Wikipedia

    en.wikipedia.org/wiki/Logarithm

    In chemistry the negative of the decimal logarithm, the decimal cologarithm, is indicated by the letter p. [63] For instance, pH is the decimal cologarithm of the activity of hydronium ions (the form hydrogen ions H + take in water). [64] The activity of hydronium ions in neutral water is 10 −7 mol·L −1, hence a pH of 7. Vinegar typically ...

  3. 0 - Wikipedia

    en.wikipedia.org/wiki/0

    For example, the decimal number 205 is the sum of two hundreds and five ones, with the 0 digit indicating that no tens are added. The digit plays the same role in decimal fractions and in the decimal representation of other real numbers (indicating whether any tenths, hundredths, thousandths, etc., are present) and in bases other than 10 (for ...

  4. DNA - Wikipedia

    en.wikipedia.org/wiki/DNA

    Cell-free fetal DNA is found in the blood of the mother, and can be sequenced to determine a great deal of information about the developing fetus. [ 113 ] Under the name of environmental DNA eDNA has seen increased use in the natural sciences as a survey tool for ecology , monitoring the movements and presence of species in water, air, or on ...

  5. Internet - Wikipedia

    en.wikipedia.org/wiki/Internet

    Video chat rooms and video conferencing are also popular with many uses being found for personal webcams, with and without two-way sound. YouTube was founded on 15 February 2005 and is now the leading website for free streaming video with more than two billion users. [93] It uses an HTML5 based web player by default to stream and show video ...

  6. HTML - Wikipedia

    en.wikipedia.org/wiki/HTML

    The original purpose of the doctype was to enable the parsing and validation of HTML documents by SGML tools based on the document type definition (DTD). The DTD to which the DOCTYPE refers contains a machine-readable grammar specifying the permitted and prohibited content for a document conforming to such a DTD.

  7. Manufacturing - Wikipedia

    en.wikipedia.org/wiki/Manufacturing

    The Modern English word manufacture is likely derived from the Middle French manufacture ("process of making") which itself originates from the Classical Latin manū ("hand") and Middle French facture ("making"). Alternatively, the English word may have been independently formed from the earlier English manufacture ("made by human hands") and ...

  8. Software bug - Wikipedia

    en.wikipedia.org/wiki/Software_bug

    In video gaming, the term "glitch" is sometimes used to refer to a software bug. An example is the glitch and unofficial Pokémon species MissingNo. In both the 1968 novel 2001: A Space Odyssey and the corresponding film of the same name , the spaceship's onboard computer, HAL 9000 , attempts to kill all its crew members.