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  1. en.wikipedia.org › wiki › MetreMetre - Wikipedia

    16 godz. temu · The metre (or meter in US spelling; symbol: m) is the base unit of length in the International System of Units (SI). Since 2019, the metre has been defined as the length of the path travelled by light in vacuum during a time interval of 1 / 299 792 458 of a second, where the second is defined by a hyperfine transition frequency of caesium.. The metre was originally defined in 1791 by the ...

  2. en.wikipedia.org › wiki › PsychologyPsychology - Wikipedia

    16 godz. temu · Psychology is the scientific study of mind and behavior. Its subject matter includes the behavior of humans and nonhumans, both conscious and unconscious phenomena, and mental processes such as thoughts, feelings, and motives.Psychology is an academic discipline of immense scope, crossing the boundaries between the natural and social sciences.Biological psychologists seek an understanding of ...

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