Take a deep breath. Now exhale. Congratulations! You’ve just done something completely ordinary, yet so mysterious that scientists still don’t know everything about it.
From https://jamesjohnson10.blogspot.com/2019/10/crimped-or-straight-lung-fiber-shape.html
from
https://jamesjohnson10.wordpress.com/2019/10/29/crimped-or-straight-lung-fiber-shape-influences-elasticity/
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