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Photo of the Day

In the fight against HIV, cows emerge as powerful secret weapon

Artificial intelligence gives Google Street View a professional touch

Why aren't the biggest animals also the fastest?

England gets its swans in a row

How playing in dirt boosts your health

Why would a wild lioness nurse a leopard cub?

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Photo blog

7 larger-than-life photos that express how much this guy loves his dog

Just because the sun isn't shining, doesn't mean it isn't beautiful outside

Winning images in dog photo contest will capture your heart

Ocean pollution is no laughing matter

Never heard of Remote Year? This photographer's zeal may change that

Pop culture and real life collide in French photographer's clever mash-ups

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Photo galleries

10 of the world's most colorful cities

9 not-so-big cities with rich cultural scenes

10 scenic highways for your daydreaming pleasure

11 preservation success stories

10 foods and beverages that boost brainpower

15 of the world's longest bridges

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