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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

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

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from article Animal testing

Mice are the most commonly used vertebrate species in animal testing and research. (Credit: Dolores Bonaparte)

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from article Animal testing

The use of animals in biomedical research remains essential, but the handling of these sentient beings must be done humanely to minimize and prevent animal harm. (Credit: U.S. Department of Agriculture)

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from article Physical science

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