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Antarctic krill, such as this specimen in the Weddell Sea with a stomach full of yellow algae, are a critical link in the ocean food web.
Take a photographic journey through Montana and enter for a chance to win a trip for two!
Eighteen percent of the world's population can't get safe drinking water. Test your water knowledge.
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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