Tuesday, March 8, 2011

Don’t Yawn On This

yawn, pguims, animal yawn, causes of yawning, theories of yawning
Hippo Yawn, originally uploaded by wwarby.

Yawning may be just an ordinary reflex action, but there is much to learn about it…

Full story Don’t Yawn On This

About the author: pguims is a college instructor by profession but a blogger by heart. He delights in music, movies, books, nature, and people. Know him more at guims' Random Science.

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