Primera vez que leo un articulo convincente al respecto. Pero el mero hecho de leerlo me dan ganas de bostezar,
Fetuses begin yawning in the womb as early as 11 weeks after conception, said Robert Provine, a developmental neuroscientist at the University of Maryland, Baltimore County.
For reasons scientists still can't explain, spontaneous yawning continues throughout life. (Studies have shot down theories about yawning to bring in more oxygen.) In fact, all vertebrates yawn, including snakes and lizards.
Contagious yawning is a different story. Only humans, chimpanzees and possibly dogs have been shown to do it.
Like contagious laughter and contagious crying, scientists have theorized that contagious yawning is a shared experience that promotes social bonding.
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