TODAY August 21, 3rd Hour: Today's Checklist: A Deep Dive Into Cortisol | Flip Phones Are Back | Catching Up With Nicole Williams English

NBC News Medical Contributor Dr. Natalie Azar shows us how cortisol may play a bigger role in our daily lives than we realize. Also, flip phones are back, and Apple is reportedly preparing its own version. Plus, catching up with Nicole Williams English as she heading back on screen for “The Girls."

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