十万个为什么·科学阅读30篇（3）
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How Do Geckos Stick to Glass Without Glue?
壁虎不靠胶水，怎么能在玻璃上爬行？
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Geckos have millions of tiny hair-like structures on their toe pads.
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Each hair splits into hundreds of even smaller tips called spatulae.
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These ultra-fine tips get close enough to surfaces for weak atomic forces to act.
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Together, these forces create strong sticking power — no liquid or glue needed.
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A gecko can lift one foot and walk upside down on smooth ceilings.
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Their toes peel off easily like tape, letting them move quickly without getting stuck.
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Scientists copied this idea to make reusable dry adhesives for space tools.
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Even a small gecko can hold its full weight using just one toe pad.