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  2. Metre - Wikipedia

    en.wikipedia.org/wiki/Metre

    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 ...

  3. Play-Doh - Wikipedia

    en.wikipedia.org/wiki/Play-Doh

    Play-Doh or also known as Play-Dough is a modeling compound for young children to make arts and crafts projects. The product was first manufactured in Cincinnati, Ohio, United States, as a wallpaper cleaner in the 1930s. [1] Play-Doh was then reworked and marketed to Cincinnati schools in the mid-1950s. Play-Doh was demonstrated at an ...

  4. Metric system - Wikipedia

    en.wikipedia.org/wiki/Metric_system

    Metric system. A kilogram mass and three metric measuring devices: a tape measure in centimetres, a thermometer in degrees Celsius, and a multimeter that measures potential in volts, current in amperes and resistance in ohms. The metric system is a decimal -based system of measurement. The current international standard for the metric system is ...

  5. YouTube Kids - Wikipedia

    en.wikipedia.org/wiki/YouTube_Kids

    YouTube Kids has faced criticism from advocacy groups, particularly the Fairplay Organization, for concerns surrounding the app's use of commercial advertising, as well as algorithmic suggestions of videos that may be inappropriate for the app's target audience, as the app has been associated with a controversy surrounding disturbing and/or ...

  6. Centimetre - Wikipedia

    en.wikipedia.org/wiki/Centimetre

    Different lengths as in respect to the electromagnetic spectrum, measured by the metre and its derived scales.The microwave is in-between 1 meter to 1 millimeter.. A centimetre (International spelling) or centimeter (American spelling), with SI symbol cm, is a unit of length in the International System of Units (SI) equal to one hundredth of a metre, centi being the SI prefix for a factor of ...

  7. Common metre - Wikipedia

    en.wikipedia.org/wiki/Common_metre

    Common metre. Common metre or common measure[1] —abbreviated as C. M. or CM —is a poetic metre consisting of four lines that alternate between iambic tetrameter (four metrical feet per line) and iambic trimeter (three metrical feet per line), with each foot consisting of an unstressed syllable followed by a stressed syllable. The metre is ...

  8. History of the metre - Wikipedia

    en.wikipedia.org/wiki/History_of_the_metre

    The metre, symbol m, is the SI unit of length. It is defined by taking the fixed numerical value of the speed of light in vacuum c to be 299 792 458 when expressed in the unit m⋅s −1, where the second is defined in terms of the caesium frequency Δν Cs. The concept of defining a unit of length in terms of a time received some comment. [192]

  9. I Can Sing a Rainbow - Wikipedia

    en.wikipedia.org/wiki/I_Can_Sing_a_Rainbow

    The song has been used to teach children names of colours. [1] [2] Despite the name of the song, two of the seven colours mentioned ("red and yellow and pink and green, purple and orange and blue") – pink and purple – are not actually a colour of the rainbow (i.e. they are not spectral colors; pink is a variation of shade, and purple is the human brain's interpretation of mixed red/blue ...