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What makes us yawn? by Brain Stuff | Mixes.VuiZ.Net
What makes us yawn?
By
Brain Stuff
Tags:
#Howstuffworks
#How stuff works
#Marshall
#Why do we yawn
#Yawning
What makes us yawn?
Brain Stuff
0:00
0:00
Description
Yawning is a universal human behavior, yet scientists still don't know exactly why we do it or what purpose it serves. Marshall Brain explores some of the theories behind yawning in this episode.
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