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2. Telescopic sight - Wikipedia

   en.wikipedia.org/wiki/Telescopic_sight

   The crosshair is the most rudimentary reticle, represented as a pair of smooth, perpendicularly intersecting lines in the shape of a "+", and the crosshair center is used for aiming the weapon. The crosshair lines geometrically resemble the X- and Y-axis of the Cartesian coordinate system , which the shooter can use as a simple reference for ...

3. Average human height by country - Wikipedia

   en.wikipedia.org/wiki/Average_human_height_by...

   According to a study in France, executives and professionals are 2.6 centimetres (1.0 in) taller, and university students are 2.55 centimetres (1.0 in) taller than the national average. [ 7] As this case shows, data taken from a particular social group may not represent a total population in some countries.

4. Tetris - Wikipedia

   en.wikipedia.org/wiki/Tetris

   Minimizing the height of the highest filled grid square over the course of the sequence. Also, it is difficult to even approximately solve the first, second, and fourth problem. It is NP-hard, given an initial gameboard and a sequence of p pieces, to approximate the first two problems to within a factor of p 1 − ε for any constant ε > 0.

5. Levelling - Wikipedia

   en.wikipedia.org/wiki/Levelling

   Levelling or leveling ( American English; see spelling differences) is a branch of surveying, the object of which is to establish or verify or measure the height of specified points relative to a datum. It is widely used in geodesy and cartography to measure vertical position with respect to a vertical datum, and in construction to measure ...

6. First-person shooter - Wikipedia

   en.wikipedia.org/wiki/First-person_shooter

   A player engaging in combat during an above-ground section in Half-Life. A first-person shooter (FPS) is a video game centered on gun fighting and other weapon-based combat seen from a first-person perspective, with the player experiencing the action directly through the eyes of the main character. [1]

7. Heights of presidents and presidential candidates of the ...

   en.wikipedia.org/wiki/Heights_of_presidents_and...

   The second-tallest unsuccessful candidate is John Kerry, at 6 ft 4 in (193 cm). The shortest unsuccessful presidential candidate is Stephen A. Douglas, at 5 ft 4 in (163 cm). The next shortest is Hillary Clinton, who lost the 2016 election and is 5 ft 5 in (165 cm). The largest height difference between two presidential candidates (out of the ...

8. Contra-rotating propellers - Wikipedia

   en.wikipedia.org/wiki/Contra-rotating_propellers

   Contra-rotating propellers Contra-rotating propellers on the Rolls-Royce Griffon-powered P-51XR Mustang Precious Metal at the 2014 Reno Air Races. Aircraft equipped with contra-rotating propellers (CRP) [1] coaxial contra-rotating propellers, or high-speed propellers, apply the maximum power of usually a single piston engine or turboprop engine to drive a pair of coaxial propellers in contra ...

9. Cristiano Ronaldo - Wikipedia

   en.wikipedia.org/wiki/Cristiano_Ronaldo

   Cristiano Ronaldo Ronaldo with Al Nassr in 2023 Personal information Full name Cristiano Ronaldo dos Santos Aveiro Date of birth (1985-02-05) 5 February 1985 (age 39) Place of birth Funchal, Madeira, Portugal Height 1.87 m (6 ft 2 in) Position(s) Forward Team information Current team Al Nassr Number 7 Youth career 1992–1995 Andorinha 1995–1997 Nacional 1997–2002 Sporting CP Senior career ...