The determination of airflow characteristics in the human upper airway is crucial in investigating obstructive sleep apnea, particle sedimentation, drug delivery, and many biomedical problems.

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Birds and mammals are on extreme ends of the airflow spectrum. Mammals inhale oxygen-rich air and they exhale depleted air, exhibiting a so-called tidal flow pattern. In contrast, bird breath travels ...

Air quality alerts in North Alabama were at unhealthy levels Monday, thanks in part to what appears to be traces of Canadian wildfire smoke being pushed southward across the continent due to unusual ...