the.com/yawn
the involuntary jaw-cracking confession that your brain wants to be anywhere but here
contagious reflexSeeing or reading about yawns can trigger one
brain coolantLikely cools an overheating brain, not lung oxygen
womb practiceFetuses yawn months before they're born
empathy linkCatching yawns correlates with social closeness
cross-speciesDogs catch yawns from their humans