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== More information ==
* [http://www.slate.com/articles/life/explainer/2012/06/ray_dolin_shot_while_hitchhiking_why_do_hitchhikers_stick_out_their_thumb_.html How sticking your thumb out became a universal gesture for hitchhiking.]
* [http://randomroads.org/story/thumbin-it-evolution-hitchhiking Thumbin' It: The Evolution of Hitchhiking]
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[[Category:History]]
