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from article Physical science

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An astronaut conducts a physical science experiment aboard the International Space Station involving buoyancy-driven convection and sedimentation, which as force-dependent phenomena occur differently in a microgravity environment. (Credit: NASA)

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from article Model theory

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Conceptual model of a system.

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from article Model theory

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Model of a regional population system.

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from article Sonobuoy

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Launch of a sonobuoy from an antisubmarine warfare (ASW) aircraft. (a) In flight. (b) Buoy strikes the water in a nearly vertical attitude. (c) Antenna and hydrophone are positioned automatically.

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from article Philosophy of science

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Pulpit Rock Park in Colorado Springs, Colorado, photographed with camera equipment sensitive to infrared wavelengths of light outside of the visible portion of the electromagnetic spectrum that humans can perceive. The "invisible" light is rendered…

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from article Philosophy of science

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Bust of the Greek polymath Aristotle. (Credit: Photos.com/Getty Images)

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from article Guided missile

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GBU-15 with data link system, mounted on F-4 Phantom II fighter. (Hughes Aircraft Co.)

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from article Guided missile

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TOW (tube-launched, optically tracked, wire-guided) antitank missile and launch tube. Wings and tails fold to permit tube mounting. (Hughes Aircraft Co.)

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from article Guided missile

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Launching of a field-mobile, short-range, all-weather surface-to-air Roland missile. The West German–French Roland has been licensed for production in the United States for use as a U.S. Army air defense weapon. (U.S. Army)

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from article Guided missile

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F-15 Eagle fighter aircraft equipped with a mixture of short-range, infrared Sidewinder and medium-range, radar Sparrow air-to-air missiles. (McDonnell-Douglas)

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