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Obama's national monuments are a big deal

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Visit Antarctica's colorful underwater world

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Unknown 'ghost octopus' found 2.6 miles deep

Bizarre Mariana Trench 'alien call' identified

Killer whales vs. shark: Drone footage shows rare attack

The Earth's mountains, rocks and water bodies are ancient. Do you know how old they are?

10 things you didn't know about seahorses

Curious 'castaway' makes imaginations run wild

Like bees of the sea, plankton pollinate plants