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from article Olenellina

A fossilized Olenellus trilobite belonging to the suborder Olenellina. This trilobite was discovered among the Early Cambrian strata of the Eager Formation in British Columbia, Canada. (Credit: Houston Museum of Natural Science)

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from article Sunfish

Bluegill (Lepomis macrochirus). (Photo by Eric Engbretson, U.S. Fish and Wildlife Service)

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from article Enceladus

Mosaic of 21 narrow-angle camera images (taken using visible, infrared, and ultraviolet filters) of Enceladus, taken by the Cassini orbiter on July 14, 2005. The Southern Hemisphere region is smoother and younger, in contrast to the older, cratered…

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from article Enceladus

Different views of the Enceladus plumes. (a) Image of back-lit (by the Sun) Enceladus, revealing the large scale of the plumes. (b) Imagery revealing eight different sources associated with the tiger-stripe features. (c) At least 30 differently…

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from article Enceladus

Back-lit view of Saturn's E ring from September 15, 2006, showing wisps of bright, icy material from Enceladus joining the E ring. The structure of the wisps contains information about the direction of grain emission, the sweeping aspect of…

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from article Enceladus

Model to explain the observation of plumes above the Enceladus tiger stripe fissures, and of sodium salts and organics in the plumes. Slightly bubbly seawater from a subsurface ocean travels through a passage in the ice crust to feed a geyser,…

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from article Archiacanthocephala

Life cycle of the giant thorn-headed worm of hogs.

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from article Syzygy

Diagram, not to scale, of the Sun, the Earth, the Moon, and a planet, illustrating syzygy. Symbols are explained in text.

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from article Speech perception

The perception of speech (as well as the production of speech) involves interactive processes occurring in various regions of the brain. Researchers also have noted the important contribution that vision makes to normal speech perception. (Copyright…

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from article Speech perception

An auditory spectrogram of the word "telephone." (a) The vertical striations in the bands represent amplitude modulation at the frequency of the voice pitch. Such striations are absent from the initial noise portion corresponding to the voiceless…