科学美国人60秒:壁虎飞檐走壁之谜-托福听力下载

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　　科学美国人60秒中英文翻译：壁虎飞檐走壁之谜

　　科学美国人60秒英文文本

　　As is well known, geckos sell car insurance.

　　But they’re also famous for their extremely adhesive feet, which can keep them stuck to walls and even ceilings.

　　Archimedes wondered how they do it.

　　Geckos can also easily loosen their grip and break into a dash, which has flummoxed physicists.

　　But scientific stick-to-itiveness finally found the on-off switch.

　　Geckos’ toes are covered in thousands of tiny hairs called setae.

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　　These setae can bend to make contact with all the grooves and crevices in a surface.

　　To adhere, the setae rely on small electromagnetic attractions between molecules called van der Waals forces.

　　Researchers created mathematical models that revealed that the default for gecko feet is non-sticky.

　　To activate the grip, the lizards extend and angle their setae to create millions of contact points with a surface.

　　The research is in the Journal of Applied Physics.

　　Scientists would love to create synthetic adhesives based on the gecko trick.

　　Perhaps by harnessing the power of setae, robots could climb walls, and stick or unstick without expending much energy, just as the gecko does.

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