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81Force — For other uses, see Force (disambiguation). See also: Forcing (disambiguation) Forces are also described as a push or pull on an object. They can be due to phenomena such as gravity, magnetism, or anything that might cause a mass to accelerate …
82Etching — For other uses of etch or etching, see Etching (disambiguation), for the history of the method, see old master prints. The Soldier and his Wife. Etching by Daniel Hopfer, who is believed to have been the first to apply the technique to… …
83François Arago — 25th Prime Minister of France In office 9 May 1848 – 24 June 1848 Preceded by Jacques Charles Dup …
84Insect wing — Original veins and wing posture of a dragonfly. Hoverflies hovering to mate …
85List of Chinese inventions — A bronze Chinese crossbow mechanism with a buttplate (the wooden components have …
86particle accelerator — accelerator (def. 7). [1945 50] * * * Device that accelerates a beam of fast moving, electrically charged atoms (ions) or subatomic particles. Accelerators are used to study the structure of atomic nuclei (see atom) and the nature of subatomic… …
87Irreducible complexity — This article covers irreducible complexity as used by those who argue for intelligent design. For information on irreducible complexity as used in Systems Theory, see Irreducible complexity (Emergence). Irreducible complexity (IC) is an argument… …
88Microphone — For the indie film, see Microphone (film). Microphones redirects here. For the indie band, see The Microphones. A …
89St Helens, Merseyside — For the larger local government district, see Metropolitan Borough of St Helens. Coordinates: 53°27′15″N 2°44′46″W / 53.4541°N 2.7461°W …
90Discworld (world) — The Discworld as it appears in the SkyOne adaptation of The Colour of Magic. The Discworld is the fictional setting for all of Terry Pratchett s Discworld fantasy novels. It consists of a large disc (complete with edge of the world drop off and… …
