To examine this question (and many others, in many fields of scientific endeavour), the American Association for the Advancement of Science (AAAS) held its annual meeting this year in San Diego.

为了检验这个疑问（和其它科学领域的问题），美国科学促进会今年在圣地亚哥举行了一年一度的会议。

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Computer graphic of nanoscale toothed gears made from DNA (left) and electron micrographs of the actual nanostructures. Photograph: Science/AAAS

由DNA制成的纳米齿轮的计算机图形（左）以及实际纳米结构的电子显微图。

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"MARK TWAIN had it backwards," Steve Schneider joked, in a lecture he gave to the American Association for the Advancement of Science (AAAS) in 1972.

1972年，史蒂夫·施奈德在美国科学促进会(AAAS)演讲时开玩笑地说：“马克·吐温也有言及不到的地方。”

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They announced their findings over the weekend at the American Association for the Advancement of Science (AAAS) conference in Boston.

FORBES: Researchers Prove Air Pollution Causes Heart Attacks

The Curiosity scientist was speaking here in Boston at the annual meeting of the American Association for the Advancement of Science (AAAS).

BBC: Nasa's Curiosity Mars rover to ingest drill sample soon

He was talking about his work here in Boston at the annual meeting for the American Association for the Advancement of Science (AAAS).

BBC: Artificial finger tests evolutionary origin of prints