This story appears in the June 2009 issue of National Geographic magazine. The world economy in the ninth century had two powerful engines. One was Tang dynasty China, an empire stretching from the ...

Buying a used car has typically been an easy way to save some cash. In the case of the Toyota RAV4 Hybrid, however, some shoppers are discovering the opposite is true. Audi has introduced the ...

Using older mice, scientists identified a key mediator of increased breast cancer metastasis, offering a potential therapeutic target for older patients.

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