Sid races around his room and finds himself breathing really fast. Sid then wonders where all the air is going in his body when he breathes in? At school, Sid and his friends discover that our bodies have lungs to help us breathe in oxygen!

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  • Episode Number 38
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  • Originally Aired Wednesday, May 6, 2009
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  • Last Updated By cricri0778
  • Last Updated 06/22/2012 9:14am