One yawn, a second, a third and it’s your turn. Many biological explanations have been put forward, but what is the scientific consensus?
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A sigh is the brain’s way of stopping the tiny sacks in your lung from collapsing.
Everybody does it, but why? Scientists aren’t really sure if exhaustion, stress or some other social factor is at the root of yawning – and how it can be so contagious.
