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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.
Think your photo is the "Ultimate" winner? Submit your best in six different categories.
See how Lipton is dedicated to sustainable agriculture. View photos from Boyd Matson's trip to Africa.
Always read up about native customs before traveling to a foreign culture. Always smile.
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Whose Earth-saving idea should win $20,000? Check out the finalists now, and vote July 7-20!