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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.
Out of 12,000 entries received, find out who takes home the Grand Prize!
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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