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Warning: this comic occasionally contains strong language (which may be unsuitable for children), unusual humor (which may be unsuitable for adults), and advanced mathematics (which may be unsuitable for liberal-arts majors). http://xkcd.com/162/

A Webcomic - Angular Momentum

quot;How Yo-Yos Work"

http://entertainment.howstuffworks.com/yo-yo.htm On the surface, the yo-yo is an incredibly simple toy -- it's really nothing but a spool attached to a length of string. But in the right hands, it can be something extraordinary: An accomplished yo-yoist can send the yo-yo flying out in all directions, make it hover in mid air, then snap it back into his or her palm.