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  2. Decibel - Wikipedia

    en.wikipedia.org/wiki/Decibel

    The decibel (symbol: dB) is a relative unit of measurement equal to one tenth of a bel ( B ). It expresses the ratio of two values of a power or root-power quantity on a logarithmic scale. Two signals whose levels differ by one decibel have a power ratio of 10 1/10 (approximately 1.26) or root-power ratio of 10 1/20 (approximately 1.12 ).

  3. Industrial Revolution - Wikipedia

    en.wikipedia.org/wiki/Industrial_Revolution

    Bradford grew by 50% every ten years between 1811 and 1851, and by 1851 only 50% of the population of Bradford were actually born there. [161] In addition, between 1815 and 1939, 20% of Europe's population left home, pushed by poverty, a rapidly growing population, and the displacement of peasant farming and artisan manufacturing.

  4. Tiger - Wikipedia

    en.wikipedia.org/wiki/Tiger

    The tiger ( Panthera tigris) is the largest living cat species and a member of the genus Panthera native to Asia. It has a powerful, muscular body with a large head and paws, a long tail, and orange fur with black, mostly vertical stripes.

  5. Technology readiness level - Wikipedia

    en.wikipedia.org/wiki/Technology_readiness_level

    e. Technology readiness levels ( TRLs) are a method for estimating the maturity of technologies during the acquisition phase of a program. TRLs enable consistent and uniform discussions of technical maturity across different types of technology. [1] TRL is determined during a technology readiness assessment ( TRA) that examines program concepts ...

  6. Human - Wikipedia

    en.wikipedia.org/wiki/Human

    Around 50–60 million people lived in the combined eastern and western Roman Empire in the 4th century AD. Bubonic plagues, first recorded in the 6th century AD, reduced the population by 50%, with the Black Death killing 75–200 million people in Eurasia and North Africa alone.

  7. United States dollar - Wikipedia

    en.wikipedia.org/wiki/United_States_dollar

    The United States dollar ( symbol: $; currency code: USD; also abbreviated US$ to distinguish it from other dollar-denominated currencies; referred to as the dollar, U.S. dollar, American dollar, or colloquially buck) is the official currency of the United States and several other countries.

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