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Land animals also have much to teach. For example, the small lizard known as a gecko has the ability to climb walls and cling upside down on ceilings. What is the secret of the gecko’s ability to defy gravity?
The gecko’s ability to stick even to glass-smooth surfaces comes from the tiny hairlike structures, called setae, that cover its feet. The feet do not exude glue. Rather, they exploit a minute molecular force.
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