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United States

Grand Canyon is a sprightly young 6-million-year-old

Earth

Grand Canyon is a sprightly young 6-million-year-old

New measurements date Arizona's vast canyon to 6 million years ago, not 70 million years as has been suggested

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60 Seconds

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Made in China: Up to a quarter of California smog

Earth

Made in China: Up to a quarter of California smog

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Health

Diet can explain half of racial blood pressure puzzle

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The seven deadly sinners driving global warming

Earth

The seven deadly sinners driving global warming

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Moth drone stays rock steady in gale-force winds

Technology

Moth drone stays rock steady in gale-force winds

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What Colorado's cannabis experiment will teach us

Life

What Colorado's cannabis experiment will teach us

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Blame slow jet stream for US deep freeze

Earth

Blame slow jet stream for US deep freeze

Regulars

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Technology

Entangled spies: Why the NSA wants a quantum computer

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US offers world's first legal recreational marijuana

Health

US offers world's first legal recreational marijuana

From 1 January, residents of Colorado aged 21 or older became the first people in the world able to buy pot for legally sanctioned recreational use

Regulars

Life

Texas repels creationist threat to biology textbooks

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Health

America's hidden epidemic of tropical diseases

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Health

Want to fix US inequality? Begin with worming tablets

Opinion

Technology

Play video games to help military secure its software

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