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==Background==
[[Image:Gecko Leaftail 1.jpg|thumb|right|300px|[[Gecko]] climbing glass using its natural [[seta]]]]
A gecko can hang on a glass surface using only one toe. This ability is attributed to [[van der Waals force]],<ref>[http://www.clemson.edu/newsroom/articles/2009/august/geckos.php5 Researchers discover how geckos know when to hold tight<!-- Bot generated title -->]</ref><ref>{{cite journal|last1=Autumn|first1=Kellar|authorlink2=Metin Sitti|last2=Sitti|first2=Metin|last3=Liang|first3=Yiching A.|last4=Peattie|first4=Anne M.|last5=Hansen|first5=Wendy R.|last6=Sponberg|first6=Simon|last7=Kenny|first7=Thomas W.|last8=Fearing|first8=Ronald|last9=Israelachvili|first9=Jacob N. ''et al.''|last10=Full|first10=R. J.|year=2002|title=Evidence for van der Waals adhesion in gecko setae|url=| journal=Proceedings of the National Academy of Sciences of the USA|volume=99|issue=19| pages=12252–12256|doi=10.1073/pnas.192252799|pmid=12198184|pmc=129431|bibcode=2002PNAS...9912252A |display-authors=8}}</ref> although a more recent study suggests that water molecules of roughly monolayer thickness (present on virtually all natural surfaces) also play a role.<ref>{{cite journal|last1=Huber|first1=G.|last2=Mantz|first2=H.|last3=Spolenak|first3=R.|last4=Mecke|first4=K.|last5=Jacobs|first5=K.|last6=Gorb|first6=S. N.|last7=Arzt|first7=E.|year=2005|title=Evidence for capillarity contributions to gecko adhesion from single spatula nanomechanical measurements|url=| journal=Proceedings of the National Academy of Sciences of the USA|volume=102|issue=45| pages=16293–16296|doi=10.1073/pnas.0506328102|pmid=16260737|pmc=1283435|bibcode=2005PNAS..10216293H }}</ref>
==Developments==
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