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  2. Birch's law - Wikipedia

    en.wikipedia.org/wiki/Birch's_law

    The velocity is the lender of the damper decided by the wave's travel time. [ clarification needed ] The resulting relationship between the density of the material and the discovered velocity is known as Birch's law.

  3. Mean - Wikipedia

    en.wikipedia.org/wiki/Mean

    The arithmetic mean (or simply mean or average) of a list of numbers, is the sum of all of the numbers divided by their count.Similarly, the mean of a sample ,, …,, usually denoted by ¯, is the sum of the sampled values divided by the number of items in the sample.

  4. Abacus - Wikipedia

    en.wikipedia.org/wiki/Abacus

    The quotient division is generally used instead of the division method; at the same time, in order to make the multiplication and division digits consistently use the division multiplication. Later, Japan had a 3:5 abacus called 天三算盤, which is now in the Ize Rongji collection of Shansi Village in Yamagata City. Japan also used a 2:5 ...

  5. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    [12] [6] The 2020 Mathematics Subject Classification contains no less than sixty-three first-level areas. [13] Some of these areas correspond to the older division, as is true regarding number theory (the modern name for higher arithmetic ) and geometry.

  6. Mars - Wikipedia

    en.wikipedia.org/wiki/Mars

    The amount of Martian deuterium (D/H = 9.3 ± 1.7 10 −4) is five to seven times the amount on Earth (D/H = 1.56 10 −4), suggesting that ancient Mars had significantly higher levels of water. Results from the Curiosity rover had previously found a high ratio of deuterium in Gale Crater , though not significantly high enough to suggest the ...

  7. Quran - Wikipedia

    en.wikipedia.org/wiki/Quran

    The total number of verses in the most popular Hafs Quran is 6,236; [k] however, the number varies if the bismillahs are counted separately. According to one estimate the Quran consists of 77,430 words, 18,994 unique words, 12,183 stems , 3,382 lemmas and 1,685 roots .

  8. List of countries by carbon dioxide emissions per capita

    en.wikipedia.org/wiki/List_of_countries_by...

    [12] According to Science for Policy report in 2024 by the Joint Research Centre (JRC – the European Commission's science and knowledge service) and International Energy Agency (IEA), in 2023, global GHG emissions primarily consisted of CO 2, resulting from the combustion of fossil fuels (73.7%). [3]

  9. 2012 phenomenon - Wikipedia

    en.wikipedia.org/wiki/2012_phenomenon

    [35] [c] Thus this inscription anticipates the current universe lasting at least 20 21 ×13×360 days, [26] or roughly 2.687×10 28 years; a time span equal to 2 quintillion times the age of the universe as determined by cosmologists. Others have suggested that this date marks creation as having occurred after that time span.