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 ...

Take a deep breath in. Slowly let it out. You have just participated in one of the most profound evolutionary revolutions on Earth--breathing air on land. It's unclear how the first vertebrates ...