Lujiazui, Shanghai's financial district, includes the world's third- and sixth-tallest buildings. The city's population is 23 million.

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Nations Grow Populations, And Face New Problems

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Does Probiotic Yogurt Really Affect Digestion?

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Scientific Case Still Open On 2001 Anthrax Attacks

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Brian Greene Explains 'The Fabric Of The Cosmos'

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Analysis Questions Flu Shot Effectiveness

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Science Diction: The Origin Of 'Bunsen Burner'

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Reinventing Fire: Getting Beyond Fossil Fuels

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Exploring Multiple Personalities In 'Sybil Exposed'

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A museum employee stands beneath a mastodon skeleton on display at the U.S. National Museum, now the Smithsonian National Museum of Natural History, circa 1917. A new study revisits an old debate about the evidence for an early mastodon hunt in North America.

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What Slew An Ancient Mastodon? DNA Tells Tale

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Brain researchers say the big fluctuations in IQ performance they found in teens were not random — or a fluke.

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IQ Isn't Set In Stone, Suggests Study That Finds Big Jumps, Dips In Teens

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Auguste Rodin's The Thinker, shown outside the Detroit Institute of Arts, depicts a man engaged in what Daniel Kahneman might describe as System 2 — or slow, deliberative — thinking.

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'Fast And Slow': Pondering The Speed Of Thought

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More Reasons To Eat Your Fruits And Veggies

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When Politics Meets Science

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Contest Seeks To Launch Student Space Projects

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Searching For Meaning In A Cheap Toaster

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