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  2. Morse code - Wikipedia

    en.wikipedia.org/wiki/Morse_code

    Morse code is a method used in telecommunication to encode text characters as standardized sequences of two different signal durations, called dots and dashes, or dits and dahs. [3] [4] Morse code is named after Samuel Morse, one of the early developers of the system adopted for electrical telegraphy .

  3. Standard deviation - Wikipedia

    en.wikipedia.org/wiki/Standard_deviation

    The standard deviation of a random variable, sample, statistical population, data set, or probability distribution is the square root of its variance. It is algebraically simpler, though in practice less robust, than the average absolute deviation.

  4. Big Tech - Wikipedia

    en.wikipedia.org/wiki/Big_Tech

    Big Tech, also known as the Tech Giants or Tech Titans, [1] are the largest IT companies in the world. The concept of Big Tech is similar to the grouping of dominant companies in other sectors. [2] It generally includes the Big Five tech companies in the United States: Alphabet (parent of Google ), Amazon, Apple, Meta, and Microsoft.

  5. Free software - Wikipedia

    en.wikipedia.org/wiki/Free_software

    Free software, libre software, or libreware [1] [2] is computer software distributed under terms that allow users to run the software for any purpose as well as to study, change, and distribute it and any adapted versions.

  6. Testosterone - Wikipedia

    en.wikipedia.org/wiki/Testosterone

    Testosterone is the primary male sex hormone and androgen in males. [3] In humans, testosterone plays a key role in the development of male reproductive tissues such as testicles and prostate, as well as promoting secondary sexual characteristics such as increased muscle and bone mass, and the growth of body hair.

  7. Earth - Wikipedia

    en.wikipedia.org/wiki/Earth

    Earth has a dynamic atmosphere, which sustains Earth's surface conditions and protects it from most meteoroids and UV-light at entry. It has a composition of primarily nitrogen and oxygen. Water vapor is widely present in the atmosphere, forming clouds that cover most of the planet. The water vapor acts as a greenhouse gas and, together with other greenhouse gases in the atmosphere ...

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