Do you yawn more when tired
than when you've just woken up?
This is the gaping gap of yawn's yolk
in 'chasmology', the study of yawning!
Why you do it, when, and what brings it on?
One quirk is that all vertebrates
reptiles, sharks, lions, kittens, and their babies
all yawn and its highly contagious.
It spreads in a room and a zoo.
One...
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