this post was submitted on 11 Nov 2024
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AskScience: Got Questions? Get Answers.

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The original post: /r/askscience by /u/HighlightFun8419 on 2024-11-10 05:46:10.

Imagine you take a really deep breath and exhale all the air from your lungs. Then, you are relaxing and only take casual breaths. Is the old air still in your lungs?

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