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Why Do We Yawn? - Health - Nairaland

Nairaland Forum / Nairaland / General / Health / Why Do We Yawn? (438 Views)

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Why Do We Yawn? by 9jamum(f): 11:22am On Nov 26, 2011
Is it because one is being tired, bored or oxygen deprived, or low temperature of the brain?
What is excessive yawning?

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