HowStuffWorks explains how birds, planes, and now ... How Superman Works!

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Please copy/paste the following text to properly cite this HowStuffWorks article:

"HowStuffWorks explains how birds, planes, and now ... How Superman Works!." 26 June 2006. HowStuffWorks.com. <http://home.howstuffworks.com/superman-pr.htm> 20 March 2010.