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  2. Pace (unit) - Wikipedia

    en.wikipedia.org/wiki/Pace_(unit)

    A pace is a unit of length consisting either of one normal walking step (approximately 0.75 metres or 30 inches), or of a double step, returning to the same foot (approximately 1.5 metres or 60 inches). The normal pace length decreases with age and some health conditions. [1] The word "pace" is also used for units inverse to speed, used mainly ...

  3. Smoky (war dog) - Wikipedia

    en.wikipedia.org/wiki/Smoky_(War_Dog)

    Smoky (c. 1943 – 21 February 1957), a Yorkshire Terrier, was a famous war dog, who served with the Allied Forces in World War II.She weighed only 4 pounds (1.8 kg) and stood 7 inches (180 mm) tall.

  4. Gunter's chain - Wikipedia

    en.wikipedia.org/wiki/Gunter's_chain

    The 66-foot (20.1 m) chain is divided into 100 links, usually marked off into groups of 10 by brass rings or tags which simplify intermediate measurement. Each link is thus 7.92 inches (201 mm) long. A quarter chain, or 25 links, measures 16 feet 6 inches (5.03 m) and thus measures a rod (or pole).

  5. Bracket - Wikipedia

    en.wikipedia.org/wiki/Bracket

    For example: in the usual order of algebraic operations, 4 × 3 + 2 equals 14, since the multiplication is done before the addition. However, 4 × (3 + 2) equals 20, because the parentheses override normal precedence, causing the addition to be done first. Some authors follow the convention in mathematical equations that, when parentheses have ...

  6. Pi - Wikipedia

    en.wikipedia.org/wiki/Pi

    e. The number (; spelled out as " pi ") is a mathematical constant that is the ratio of a circle 's circumference to its diameter, approximately equal to 3.14159. The number appears in many formulae across mathematics and physics.

  7. Fibonacci sequence - Wikipedia

    en.wikipedia.org/wiki/Fibonacci_sequence

    With the exceptions of 1, 8 and 144 (F 1 = F 2, F 6 and F 12) every Fibonacci number has a prime factor that is not a factor of any smaller Fibonacci number (Carmichael's theorem). [56] As a result, 8 and 144 (F 6 and F 12) are the only Fibonacci numbers that are the product of other Fibonacci numbers. [57]

  8. Great Pyramid of Giza - Wikipedia

    en.wikipedia.org/wiki/Great_Pyramid_of_Giza

    They face each other and are located approximately 0.91 m (3.0 ft) above the floor, 2.5 m (8.2 ft) from the eastern wall, with a width of 18 and 21 cm (7.1 and 8.3 in) and a height of 14 cm (5.5 in). Both start out horizontally for the length of the granite blocks they go through before changing to an upwards direction.

  9. Vacuum - Wikipedia

    en.wikipedia.org/wiki/Vacuum

    For example, a typical vacuum cleaner produces enough suction to reduce air pressure by around 20%. [3] But higher-quality vacuums are possible. Ultra-high vacuum chambers, common in chemistry, physics, and engineering, operate below one trillionth (10 −12 ) of atmospheric pressure (100 nPa), and can reach around 100 particles/cm 3 . [ 4 ]