Think about someone yawning. Jaws gape. Lips spread wide. Arms stretch. There's that quick inhale and the long aaaahhhhh. Yawning yet?
Don't worry. We're not offended. In fact, according to a new Drexel University study, you're just being kind.
Yawning is an ancient, primitive act. Humans do it even before they're born, opening wide in the womb. Some snakes unhinge their jaws to do it. One species of penguins yawns as part of mating.
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