When did we find out why we need to breathe?

When did we find out why we need to breathe?

Posted January 16, 2026

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As Hank loves to say, our knowledge is always evolving. It wasn’t until the 1500s that anyone knew why we needed to breathe!

Later on, Hank talks about knowledge scaffolding and how every fact we learn has to hang off of another fact that we already knew, otherwise it’s immediately forgotten. Hear more about this in his interview with Joss Fong: Hank Green’s College Journey: From Biochemistry to YouTube.
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