https://www.sciencefocus.com/the-human-body/why-do-we-sigh
Why do we sigh? - BBC Science Focus Magazine
Jul 12, 2023 - Unlike yawning, sighing isn't contagious, suggesting it serves a physical function rather than a form of communication - so what is the purpose of a sigh?
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https://whatisthat.bbcdigitalguerrillas.co.uk/
What Is That? | BBC Science
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