Why do we yawn?
By Owner-neok12From youtube.com
499.8K views
50.8K likes
Jonathan discusses why we yawn, which we as humans have yet to figure out.
Tags
Brain
Breathe
Cool
Tired
Bored
Signal
Rest
Yawn
Reflex
Sleepy
Oxygen
Inhale
Stretch
Air
Carbon
Awake
Habit
Yawn
Dioxide
Exhale
Alert
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