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Prairie Hills

Photo: Green prairie hills carved by serpentine valleys
WALLPAPER

Valleys carve up Kansas' Texaco Hill, part of the Tallgrass Prairie National Preserve. Tallgrass prairie once blanketed some 140 million acres (57 million hectares) of North America, but more than 95 percent has vanished.

Photograph by Jim Richardson

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Long Exposures

When making long exposures, use a remote release to avoid camera movement. If you don't have a remote release, use the camera's self-timer.

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