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Bougainville residents overwhelmingly vote to become world's newest nation

Catastrophic fires in Australia raise concerns about the future of koalas

Why new buildings in NYC are about to become much safer for birds

5 surprising facts about orcas

Visitors flock to see Lithuanian Christmas tree that resembles chess piece

A blue whale's heart may only beat twice per minute when diving for food

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Photo blog

A Danish artist hid these recycled giants in the woods for you to find

Greenland's ice sheet briefly hosted the world's tallest waterfall

Mysterious ring galaxy continues to puzzle astronomers

Meteorological winter arrives with a roar in North America

Radical coffee cup design takes aim at plastic lids

Polar bear photos 'testify to the beauty of this fragile world'

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Photo galleries

9 of the worst viruses on Earth

Free bird: Thanksgiving turkey pardons

7 superhuman senses

9 magnificent images of Mercury

9 surreal images of Venus

12 incredible images of Saturn

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