What makes you yawn?!
Question:
What makes you yawn?
does it have anything to do with too much oxygen in ur lungs cuase thats what i heard but i don't understand why that would make you yawn?
Answers:
No one really knows for sure, or even why we yawn, but some studies have been done on this phenomenon. One popular explanation is that yawning allows you to get rid of too much carbon dioxide in your system and increase your oxygen supply, but this has been disproven. You can read more at these links.
http://www.howstuffworks.com/question572...
http://www.world-science.net/exclusives/...