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Like humans, orangutans 'talk' about the past

This unique warbler is 3 bird species in 1

5 tips for winter birding

Federal judge halts construction of Keystone XL pipeline

When Earth gets this colorful sheen, it's called airglow

White rhinos team up to save another rhino species poached out of existence

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Photo blog

Next-gen weather satellite dishes up eye candy over the Pacific

Jezero Crater will host NASA's next Mars rover

5 animal tracks you can identify in your yard

The bittersweet beauty of Greenland's melting glaciers

Death toll continues to rise in California wildfires

5 things to know about the Mars InSight Lander

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9 of the coldest places in the world to live

Free bird: Thanksgiving turkey pardons

10 cultural variations on Thanksgiving

10 international destinations for novice travelers

13 facts to change the way you see elephants

16 of the world's longest bridges

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