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Geckos can stick to walls and ceilings because of van der Waals forces.
A molecule with a difference in charge, from end to end

In chemistry, van der Waals' forces are a type of intermolecular force. An intermolecular force is a relatively weak force that holds molecules together. Van der Waals' forces are the weakest type of intermolecular force. They are named after the Dutch scientist Johannes Diderik van der Waals (1837–1923).

Negatively charged electrons orbit molecules or ions. The electrons create slightly different charges from one end of the molecule to the other. These slight differences are called partial charges, as δ- or δ+.  view more...

Van Der Waals Forces

Van Der Waals Forces
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